Maxim Index — Alphabetical Reference →

Legal maxims are the compressed wisdom of the common law — single Latin phrases that carry whole doctrines. For the judiciary and CLAT-PG candidate, they are also high-frequency, low-effort marks: a one-line definition correctly paired with a leading Indian authority can swing an objective question or anchor a descriptive answer. This page is a consolidated alphabetical reference to the maxims that recur across constitutional, criminal, contract, evidence and procedural law. Each entry gives the literal meaning, the doctrine it encapsulates, the Indian statutory peg where one exists, and the case that examiners expect you to cite. Use it as a revision spine; for thematic depth follow the cross-links into the dedicated chapters on the Legal Maxims hub.

How to Use This Index

The entries below are grouped by initial letter and, within each letter, ordered alphabetically. For every maxim three things are worth committing to memory: the literal translation, the doctrine it stands for, and one flagship authority. Examiners rarely ask for an essay on a maxim in isolation; instead they slip it into a problem ("the magistrate sat in judgment over a dispute in which his brother was a party — which maxim is offended?") or into a one-mark match-the-following. Knowing the anchor case lets you write a sentence of application rather than a bare gloss.

A word of caution on citations. Several popular maxims are mis-cited online — wrong AIR numbers, invented benches, or holdings attributed to the wrong case. The authorities below have been checked against reported judgments. Where a maxim has no single "home" case in India, this index says so rather than inventing one. For the conceptual scaffolding — what a maxim is, why courts use them, and their interpretive limits — begin with the Introduction chapter before drilling into the thematic sets on justice and criminal law.

A — Actus, Audi and the Foundations of Liability

Actus non facit reum nisi mens sit rea — "an act does not make a person guilty unless the mind is also guilty." This is the cornerstone of criminal liability, demanding the concurrence of a guilty act (actus reus) and a guilty mind (mens rea). The maxim runs through the Indian Penal Code, 1860 and is carried forward into the Bharatiya Nyaya Sanhita, 2023, where culpability is built around words like "intentionally," "knowingly," "dishonestly" and "fraudulently." The classic Indian illustration of how strongly courts presume a mental element is State of Maharashtra v. Mayer Hans George (AIR 1965 SC 722), where the Supreme Court held that the presumption of mens rea can be displaced only where the statute, expressly or by necessary implication, creates strict liability. The maxim is developed at length in the criminal-law maxims chapter.

Actus reus — the "guilty act," the physical element of a crime, which must be voluntary; an involuntary movement (a reflex, an act done in sleep) is not actus reus. Audi alteram partem — "hear the other side." One of the twin pillars of natural justice, it requires that no one be condemned unheard. In Maneka Gandhi v. Union of India (AIR 1978 SC 597) a seven-Judge Bench held that the principles of natural justice, and audi alteram partem in particular, are implicit in the "procedure established by law" under Article 21, and that even where a statute is silent the rule will be read in unless expressly excluded. The Court stressed that the rule is flexible — a full hearing in some situations, a minimal one in others — but its core cannot be abrogated. Ad hoc — "for this"; for a particular purpose only. A fortiori — "with stronger reason"; if one proposition is true, a related but stronger one follows even more clearly.

B and C — Bona Fides, Caveat and Consensus

Bona fide — "in good faith." Good faith is defined in Indian law in two divergent ways: section 52 of the Indian Penal Code (now section 2(11), Bharatiya Nyaya Sanhita, 2023) requires "due care and attention," whereas section 3(22) of the General Clauses Act, 1897 treats a thing as done in good faith if done honestly, whether negligently or not. The distinction is a frequent trap in objective papers. Caveat emptor — "let the buyer beware." The buyer, not the seller, bears the risk of quality in a sale; the rule is reflected in section 16 of the Sale of Goods Act, 1930, which begins with the proposition that there is no implied warranty as to quality or fitness, subject to important exceptions. Modern consumer-protection legislation has substantially eroded the maxim, shifting toward caveat venditor ("let the seller beware").

Consensus ad idem — "agreement to the same thing." There is no contract unless the parties agree upon the same thing in the same sense; section 13 of the Indian Contract Act, 1872 defines consent in precisely these terms, and section 10 makes free consent essential to a valid contract. Cestui que trust — the beneficiary for whose benefit a trust is held. Contra proferentem — "against the offeror"; an ambiguous term in a contract is construed against the party who drafted it, a rule of particular force in insurance and standard-form contracts. These contract-side maxims are treated in detail in the contract maxims chapter.

D and E — Delegation, Damnum and Estoppel

Damnum sine injuria — "damage without legal injury." Actual loss unaccompanied by violation of a legal right gives no cause of action; the lawful exercise of one's own rights, even if it harms a neighbour's trade, is not actionable (the classic illustration being Gloucester Grammar School case, where a rival schoolmaster who undercut fees caused loss but no legal injury). Its mirror image is injuria sine damno — "legal injury without damage" — where the violation of a legal right is actionable even without proof of actual loss, the leading authority being Ashby v. White (1703), in which a qualified voter wrongfully prevented from voting recovered though his candidate had won.

Delegatus non potest delegare — "a delegate cannot further delegate." Authority entrusted to a person for the exercise of his own judgment cannot ordinarily be sub-delegated unless the parent statute permits it expressly or by necessary implication; the maxim is a rule of construction rather than an inflexible rule of law, and is central to the law of delegated legislation. De minimis non curat lex — "the law does not concern itself with trifles," reflected in section 95 of the Indian Penal Code (harm so slight that no person of ordinary sense would complain). Ejusdem generis — "of the same kind"; where general words follow an enumeration of specific things of one genus, the general words are confined to that genus — a workhorse of statutory interpretation. Estoppel — a party who by representation induces another to alter his position is precluded from denying the truth of that representation; section 115 of the Indian Evidence Act, 1872 (now section 121, Bharatiya Sakshya Adhiniyam, 2023) codifies the rule.

F to H — Falsus, Functus and Habeas Corpus

Falsus in uno, falsus in omnibus — "false in one thing, false in everything." Significantly, the Supreme Court of India has repeatedly held that this maxim is not a rule of law in India but at most a rule of caution; in Ugar Ahir v. State of Bihar (AIR 1965 SC 277) and later decisions the Court directed that the testimony of a witness be sifted, the grain separated from the chaff, rather than rejected wholesale because part is unreliable. This is a favourite examiner trap — the maxim states a rule the Indian courts have declined to adopt. Functus officio — "having discharged his office"; once an authority has exercised its power and rendered a final decision, it cannot reopen or alter it absent statutory power to review.

Fraus omnia corrumpit — "fraud vitiates everything"; a judgment or transaction obtained by fraud is a nullity, a principle the Supreme Court applied robustly in S.P. Chengalvaraya Naidu v. Jagannath (AIR 1994 SC 853), holding that a decree obtained by suppression of material facts can be set aside in any proceeding. Habeas corpus — "you shall have the body"; the great prerogative writ commanding production of a detained person, available under Articles 32 and 226 of the Constitution to test the legality of detention. These procedural maxims connect closely to the court-proceedings set.

I — Ignorance, Injury and In Pari Delicto

Ignorantia juris non excusat — "ignorance of law is no excuse." Everyone is presumed to know the law; a mistake of law, however honest, is no defence. Its companion is ignorantia facti excusat — "ignorance of fact excuses." Indian criminal law embodies both: sections 76 and 79 of the Indian Penal Code (now sections 14 and 17, Bharatiya Nyaya Sanhita, 2023) excuse acts done under a mistake of fact in good faith, but extend no protection to a mistake of law. The rationale, as courts have explained, is a legal fiction created out of necessity and convenience — the administration of justice would be impossible if ignorance of law were a defence.

In pari delicto potior est conditio defendentis — "where both parties are equally at fault, the position of the defendant is the stronger"; a plaintiff founding his claim on his own illegality will generally be denied relief, a principle that surfaces in section 23 of the Indian Contract Act, 1872 (unlawful consideration and object) and in the law of restitution. Interest reipublicae ut sit finis litium — "it is in the interest of the State that there be an end to litigation," one of the twin maxims underlying res judicata under section 11 of the Code of Civil Procedure, 1908. In limine — "at the threshold"; a petition dismissed in limine is rejected at the outset without a full hearing on merits.

J to L — Judex, Jus and Locus Standi

Jus — "right" or "law." Jus in rem is a right available against the world at large (e.g. ownership), while jus in personam is a right available against a determinate person (e.g. a contractual claim). Jus naturale — natural law; jus cogens — a peremptory norm of international law from which no derogation is permitted. Locus standi — "place of standing"; the legal capacity to bring an action. The traditional requirement that only a person whose own right is affected may sue was relaxed in the public-interest-litigation era, the Supreme Court in S.P. Gupta v. Union of India (AIR 1982 SC 149, the Judges' Transfer case) holding that any member of the public acting bona fide may move the Court where a legal wrong is caused to a person or class unable to approach it themselves.

Lex non cogit ad impossibilia — "the law does not compel the impossible"; a person is not bound to do what is impossible, a principle of fairness imported into the construction of statutes and contracts. Leges posteriores priores contrarias abrogant — "later laws repeal earlier inconsistent ones," the basis of the doctrine of implied repeal. Lis pendens — "a pending suit"; section 52 of the Transfer of Property Act, 1882 provides that during the pendency of a suit concerning immovable property, the property cannot be transferred so as to affect the rights of any party under the eventual decree.

M and N — Mens Rea, Nemo Judex and Natural Justice

Mens rea — "guilty mind," the mental element of a crime, the necessary counterpart to actus reus under the maxim discussed under Letter A. Nemo judex in causa sua — "no one should be a judge in his own cause." The second pillar of natural justice, the rule against bias, requires that the adjudicator have no personal, pecuniary or other interest in the outcome. The landmark Indian authority is A.K. Kraipak v. Union of India (AIR 1970 SC 150), where a member of a selection board was himself a candidate; the Supreme Court held that even though he abstained when his own name was considered, his participation created a reasonable likelihood of bias and vitiated the selection. The Court famously held that proof of actual bias is unnecessary — a reasonable apprehension of bias suffices — and that natural justice extends to administrative as well as quasi-judicial functions, the line between them being thin and "gradually obliterating."

Nemo dat quod non habet — "no one can give what he does not have"; a seller cannot pass a better title than he himself holds, the general rule in section 27 of the Sale of Goods Act, 1930, subject to exceptions protecting bona fide purchasers. Nemo debet bis vexari pro una et eadem causa — "no one should be vexed twice for the same cause," the principle behind the bar against double jeopardy in Article 20(2) of the Constitution and section 300 of the Code of Criminal Procedure. Noscitur a sociis — "a word is known by the company it keeps"; the meaning of an ambiguous word may be gathered from the words associated with it. The two natural-justice maxims here are the heart of the justice maxims chapter.

O and P — Obiter, Pari and Prima Facie

Obiter dictum — "a saying by the way"; an observation by a court on a point not essential to the decision, which is persuasive but not binding, as distinct from the ratio decidendi (the binding reason for the decision). Onus probandi — "the burden of proof"; under section 101 of the Indian Evidence Act, 1872 (now section 104, Bharatiya Sakshya Adhiniyam, 2023) the burden lies on the party who asserts the affirmative of an issue. Pari passu — "on equal footing"; creditors ranking pari passu share rateably without preference, a concept central to insolvency distribution.

Pari delicto — see in pari delicto above. Prima facie — "at first sight"; evidence sufficient to establish a fact unless rebutted. Pacta sunt servanda — "agreements must be kept," the foundational principle of the binding force of contracts and of treaty law. Per incuriam — "through lack of care"; a decision rendered in ignorance of a binding statute or precedent is per incuriam and loses its binding force, an exception to stare decisis recognised by the Supreme Court. Pendente lite — "during litigation"; relief such as maintenance or an injunction granted while the suit is pending.

Q and R — Qui Facit, Res Ipsa and Res Judicata

Qui facit per alium facit per se — "he who acts through another acts himself." This is the conceptual basis of vicarious liability: a master is liable for the torts of his servant committed in the course of employment, as though he had committed them himself; its sibling is respondeat superior ("let the superior answer"). Quid pro quo — "something for something"; the reciprocal consideration that supports a contract. Quantum meruit — "as much as he has earned"; a claim for reasonable remuneration for work done where no price was fixed or where a contract has been discharged, recognised in section 70 of the Indian Contract Act, 1872.

Res ipsa loquitur — "the thing speaks for itself." In negligence, where the accident is of a kind that does not ordinarily happen without negligence and the instrumentality was within the defendant's exclusive control, the very occurrence raises a presumption of negligence, shifting the evidential burden. The leading Indian application is Municipal Corporation of Delhi v. Subhagwanti (AIR 1966 SC 1750), the Clock Tower collapse case, where the Supreme Court upheld the doctrine: the collapse of a structure within the Corporation's exclusive control, killing passers-by, was itself sufficient to infer negligence, and the Corporation was liable whether the defect was latent or patent. Res judicata — "a matter already adjudged"; a matter finally decided between the same parties cannot be relitigated, codified in section 11 of the Code of Civil Procedure, 1908. Respondeat superior — see qui facit per alium facit per se above.

S to U — Stare Decisis, Ubi Jus and Ut Res Magis

Salus populi suprema lex — "the welfare of the people is the supreme law," a maxim of public necessity invoked to justify regulatory and emergency action in the public interest. Stare decisis — "to stand by decided matters"; the doctrine of binding precedent, reinforced in India by Article 141 of the Constitution, which makes the law declared by the Supreme Court binding on all courts within the territory of India. Sub judice — "under judicial consideration"; a matter pending before a court should not be prejudiced by outside comment.

Ubi jus ibi remedium — "where there is a right, there is a remedy." Wherever the law confers a right it also affords a means to vindicate it; the maxim traces to Ashby v. White (1703) and underlies the constitutional remedy in Article 32, which the Supreme Court has itself called the "heart and soul" of the Constitution. Uberrimae fidei — "of the utmost good faith"; certain contracts, notably insurance, require full disclosure of all material facts by the party with knowledge. Ut res magis valeat quam pereat — "it is better that a thing should have effect than be made void"; courts construe statutes and instruments so as to give them effect rather than render them nugatory — a leading rule of harmonious construction. For the procedural maxims that recur in litigation, see the court-proceedings chapter.

V — Volenti and the Limits of Consent

Volenti non fit injuria — "to one who consents, no injury is done." A person who voluntarily and with full knowledge assumes a risk cannot afterwards complain of the harm that materialises; consent is a complete defence in tort. The defence is narrowly construed: mere knowledge of a risk (scienti) is not the same as consent to it (volenti), and the consent must be free, not the product of compulsion or of a duty to act — hence a rescuer who is injured saving life is generally not met with the defence (the "rescue cases"). The maxim also has no application where the defendant's negligence itself created the danger, or where statute forbids contracting out of liability.

Vigilantibus non dormientibus jura subveniunt — "the law assists the vigilant, not those who sleep on their rights"; the policy rationale behind limitation statutes such as the Limitation Act, 1963 and behind the equitable doctrines of laches and delay. A party who delays unreasonably in asserting a right may find the door of relief closed even where the right itself was good. Together these maxims close the alphabetical sweep — from the foundations of liability under Letter A to the limits of consent and diligence here.

Exam Strategy: Turning Maxims into Marks

Three habits convert this index into reliable marks. First, pair every maxim with one authority. "Natural justice" is a weak answer; "A.K. Kraipak v. Union of India applied nemo judex in causa sua to an administrative selection and held that a reasonable apprehension of bias suffices" is a strong one. Second, learn the statutory peg. Many maxims have a precise home in Indian legislation — estoppel in section 115 of the Evidence Act, res judicata in section 11 CPC, mistake of fact in sections 76 and 79 IPC — and citing the section signals command of the black-letter law, not just the Latin.

Third, know the maxims the Indian courts have rejected or qualified. Falsus in uno falsus in omnibus is the classic example: it is not a rule of law in India, and writing that the court must "separate the grain from the chaff" rather than discard the whole testimony shows genuine understanding. Similarly, caveat emptor has been heavily diluted by consumer-protection law, and locus standi has been liberalised by public-interest litigation. The maxim is the hook; the Indian gloss is where the marks lie. Revise this index alongside the Introduction and the thematic chapters, and you will carry a portable, exam-ready map of the doctrines the syllabus tests most often.

Frequently asked questions

Which legal maxim is the foundation of criminal liability in India?

Actus non facit reum nisi mens sit rea — "an act does not make a person guilty unless the mind is also guilty." It requires the concurrence of a guilty act (actus reus) and a guilty mind (mens rea), and runs through both the Indian Penal Code, 1860 and the Bharatiya Nyaya Sanhita, 2023. The Supreme Court in State of Maharashtra v. Mayer Hans George held that the presumption of mens rea is displaced only where the statute, expressly or by necessary implication, creates strict liability.

What are the two pillars of natural justice and their maxims?

The two pillars are audi alteram partem ("hear the other side" — the right to a fair hearing) and nemo judex in causa sua ("no one should be a judge in his own cause" — the rule against bias). Maneka Gandhi v. Union of India (AIR 1978 SC 597) read audi alteram partem into Article 21, while A.K. Kraipak v. Union of India (AIR 1970 SC 150) applied the rule against bias and held that a reasonable apprehension of bias is enough to vitiate a decision.

Is 'falsus in uno, falsus in omnibus' applied by Indian courts?

No — and this is a common exam trap. The Supreme Court has repeatedly held that falsus in uno, falsus in omnibus is not a rule of law in India but at most a rule of caution. In Ugar Ahir v. State of Bihar (AIR 1965 SC 277) and later cases the Court directed that the testimony of a witness be sifted — the grain separated from the chaff — rather than rejected wholesale merely because part of it is found unreliable.

What is the difference between 'damnum sine injuria' and 'injuria sine damno'?

Damnum sine injuria means damage without legal injury — actual loss with no violation of a legal right, which is not actionable (illustrated by the Gloucester Grammar School case). Injuria sine damno means legal injury without damage — violation of a legal right is actionable even without proof of actual loss, the leading authority being Ashby v. White (1703), where a wrongfully turned-away voter recovered though his candidate had won.

Which maxim underlies the doctrine of res ipsa loquitur and which Indian case applied it?

Res ipsa loquitur itself means "the thing speaks for itself." Where an accident does not ordinarily happen without negligence and the instrumentality was within the defendant's exclusive control, the occurrence raises a presumption of negligence. The leading Indian application is Municipal Corporation of Delhi v. Subhagwanti (AIR 1966 SC 1750), the Clock Tower collapse case, where the Supreme Court inferred negligence from the collapse alone and held the Corporation liable whether the defect was latent or patent.

What does 'ubi jus ibi remedium' mean and how does it connect to the Constitution?

Ubi jus ibi remedium means "where there is a right, there is a remedy" — wherever the law confers a right it also provides the means to vindicate it. The maxim traces to Ashby v. White (1703). In Indian constitutional law it underlies Article 32, the right to constitutional remedies, which the Supreme Court has described as the "heart and soul" of the Constitution because it guarantees an enforceable remedy for the violation of fundamental rights.