Definition
In law, animus means the mental state, intention, or purpose accompanying an act. It asks not just what a person did, but what they meant by doing it. The term functions primarily as a qualifying component in compound Latin phrases that specify the particular intent at issue — animus furandi (intent to steal), animus manendi (intent to remain), animus revertendi (intent to return), and so on. Each compound phrase names a distinct mental state relevant to a distinct legal question.
As a standalone term, animus appears in criminal law, property law, contract interpretation, and evidence, always pointing to the purposive dimension of conduct. Courts apply it to determine whether an act carries the legal consequence the law attaches to that particular intent.
---
Common Language
Modern common usage (Wiktionary): A feeling of enmity, animosity, or ill will; also, in Jungian psychology, the masculine aspect of the feminine psyche.
Historical common usage (Webster's 1913): Animating spirit; intention; temper.
The gap matters. In ordinary modern English, animus has narrowed to mean hostility — "she bore him animus." In law, animus is neutral with respect to affect: it means intent or purpose, which may be benign (animus donandi, the intent to give a gift), predatory (animus furandi, the intent to steal), or merely locative (animus manendi, the intent to remain in a place). A researcher encountering animus in a legal source should resist reading hostility into the term unless context or the specific compound phrase warrants it.
---
Common Confusion
Two distinct confusions arise. First, modern readers conflate legal animus with colloquial animus (hostility), importing an adversarial charge the legal term does not carry. Second, animus is sometimes confused with mens rea, with which it overlaps but is not identical. Mens rea is the broader common law concept of a guilty mind — a requirement of culpable mental state for criminal liability. Animus is a civil-law-derived term for the specific intent or purpose accompanying any act, criminal or civil, guilty or innocent. All animus in a criminal context may be relevant to mens rea analysis, but not all uses of animus are mens rea inquiries. The term appears just as naturally in property disputes (intent to abandon, intent to dedicate) or contract interpretation (intent of the parties) where no guilty mind is in question.
---
Recognized Forms
/SUBTYPES
The term operates almost entirely through its compound forms. The most frequently encountered in the corpus include:
ANIMUS CANCELLANDI — intention to cancel or destroy a will or instrument.
ANIMUS CAPIENDI — intention to seize or take.
ANIMUS DEDICANDI — intention to dedicate property to public use.
ANIMUS DEFAMANDI — intention to defame.
ANIMUS DONANDI — intention to make a gift; essential element in the law of gifts and inter vivos transfers.
ANIMUS FURANDI — intention to steal; the specific intent component in larceny.
ANIMUS LUCRANDI — intention to gain or profit.
ANIMUS MANENDI — intention to remain; bears on domicile analysis.
ANIMUS POSSIDENDI — intention to possess; the mental element of legal possession.
ANIMUS REVERTENDI — intention to return; relevant to the law of escaped or strayed animals and to domicile.
ANIMUS REVOCANDI — intention to revoke, particularly a will.
ANIMUS TESTANDI — intention to make a will; required for valid testamentary execution.
Anderson's Dictionary of Law preserves a fuller catalogue of these compounds than either edition of Black's and is the most useful shelf source for tracing a specific compound phrase.
---
Why It Matters in Research
The principal research challenge is that animus rarely appears in legal sources as a bare term. It travels in compound form, and the compound defines the legal question. A researcher who does not recognize the specific compound — or who encounters a partial, abbreviated, or Anglicized version of one — risks misreading what intent is actually at issue.
Several navigational cautions apply:
Historical sources use animus compounds without translation and without explanation, assuming a reader trained in civil-law Latin. Nineteenth-century American and English case reports, treatises, and pleading manuals freely deploy these phrases in untranslated form. Researchers unfamiliar with the compounds should treat Anderson's or Burrill's compound-form entries as a decoding tool before engaging the primary source.
The domicile cluster (animus manendi, animus revertendi, animus non revertendi) is particularly active in probate, conflict of laws, and citizenship cases. These phrases appear in succession disputes, estate tax matters, and expatriation cases well into the twentieth century.
In criminal law, animus furandi is the historical predecessor to the specific intent analysis in larceny and theft. Early common law opinions use the Latin phrase where modern opinions use the phrase "intent to permanently deprive." The doctrinal content is the same; the vocabulary shifted.
In property law, animus possidendi is the intent prong of the dual-element test for possession (corpus + animus). Cases involving adverse possession, bailment, and conversion frequently turn on this distinction. Researchers tracing possession doctrine across centuries will encounter the term shifting from Latin form to translated form without the underlying doctrine changing.
The civil-law origin of the term means it appears with greater frequency and precision in Louisiana materials, civilian treatises, and in academic commentary drawing on Roman law sources than in mainstream common law reporters.
---
Historical Dictionary Support
The four shelf sources agree on the core definition — mind, intention, disposition, will — and all four trace the term to the civil law. Burrill's entry is the most substantive for doctrinal context, pairing the definition with the maxim Animus hominis est anima scripti (the intention of the party is the soul of the instrument) and connecting the term to instrument construction. That maxim, cited to 3 Bulstrode 67, encapsulates the interpretive principle that animates the term across property and contract law: the legal effect of a document tracks the intent of its maker.
Anderson's is the most useful for compound-form cataloguing, listing the full declension (animus, animum, animo) alongside a substantial series of compound phrases with brief definitions. This makes it the best first stop when a researcher needs to identify an unfamiliar compound.
Both editions of Black's offer parallel, economical definitions, with the Second Edition providing slightly expanded compound-form entries including admiralty citations for animus capiendi. Neither Black's edition matches Anderson's or Burrill's for depth on the compound forms.
What the historical dictionaries do not address: the modern constitutional usage of animus in equal protection doctrine — where courts ask whether discriminatory legislation was animated by bare animus toward a group — is entirely absent from these sources. That usage, developed through twentieth-century case law, is a meaningful extension of the term's meaning and requires attention to sources outside the historical dictionary shelf.
---
Jurisdictional Note
Louisiana and other mixed jurisdictions with civilian heritage use animus compounds with greater doctrinal precision and frequency than purely common law jurisdictions. In domicile law, the animus manendi framework is standard across American courts but the specific Latin terminology is more consistently preserved in conflict-of-laws scholarship and in courts with civilian influence. The modern constitutional "animus" doctrine (equal protection) is federal in origin and has no direct civilian or common law antecedent in these dictionaries.
---
Encyclopedia Cross-Reference
See Law Mind Encyclopedia: MENS REA; POSSESSION; DOMICILE; GIFTS (INTER VIVOS).
---