Definition
A Latin ablative term meaning "with the intention," "with the disposition," or "with the design or will." In legal usage, *animo* functions almost exclusively as a prefix or modifier, pairing with a second Latin word to designate a specific mental state or intent relevant to a legal question. It is rarely used in isolation; its significance lies in the compound phrases it forms.
The phrase *quo animo* — "with what intention" — is the interrogative formulation, used to frame the inquiry into a party's mental state at the time of an act. The compound constructions are numerous, each identifying a distinct intentional state:
- *Animo cancellandi*: with the intention to cancel (a will or instrument)
- *Animo furandi*: with the intention to steal; the mental element historically central to larceny
- *Animo lucrandi*: with the intention to gain or profit
- *Animo manendi*: with the intention to remain; the intent element of domicile
- *Animo morandi*: with the intention to stay or delay
- *Animo republicandi*: with the intention to republish (a revoked will)
- *Animo revertendi*: with the intention to return
- *Animo testandi*: with the intention to make a will
Each compound operates as a term of art within its doctrinal context. The term does not carry substantive legal meaning on its own — the second element of the phrase supplies the content; *animo* supplies the frame: that what matters is the subjective intention with which an act was performed.
Common Confusion
*Animo* is sometimes loosely equated with *mens rea*, but the two are not synonymous. *Mens rea* is a broad Anglo-American doctrinal concept encompassing guilty mind across criminal law. *Animo* constructions are narrower — they identify a specific, named intent directed at a specific purpose (stealing, remaining, cancelling). Additionally, *animo* should not be confused with *animus*, the related nominative form. *Animus* refers to the intention or mind itself as a noun (e.g., *animus revertendi*, the intention of returning); *animo* is the ablative, meaning "with the intention." Both forms appear in the legal literature, sometimes interchangeably, which can cause confusion when reading older sources. Researchers should check which form a source uses and treat them as functionally equivalent in most legal contexts, while remaining alert to grammatical distinctions that occasionally bear on meaning.
Why It Matters in Research
Researchers encounter *animo* constructions throughout pre-twentieth-century case law, treatises, and equity pleadings, particularly in four recurring doctrinal zones: (1) criminal law, where *animo furandi* defined the intent element of common law larceny; (2) domicile and conflict of laws, where *animo manendi* (or *animus manendi*) was the controlling test for whether a person had established a new domicile; (3) wills and succession, where *animo cancellandi*, *animo republicandi*, and *animo testandi* governed questions of revocation, revival, and testamentary intent; and (4) property and possession, where intent to remain or return shaped questions of abandonment and adverse possession.
The Latin phrasing drops off sharply in American legal writing after the mid-twentieth century. Modern courts and statutes replace these constructions with English equivalents — "intent to steal," "intent to remain permanently" — but the underlying legal standards they describe often survive intact. A researcher reading a nineteenth-century case on domicile will encounter *animo manendi* where a modern case would say "intent to make a place one's permanent home." The concepts are the same; the vocabulary has shifted. Failure to recognize the Latin equivalent can cause a researcher to miss controlling authority or to misread the analytical framework a court is applying.
Because *animo* compounds appear across multiple doctrines, corpus searches should not rely on a single phrase. Searching *animo furandi* will not surface cases using *animus furandi*, and neither will surface the English-language equivalents used in later cases on the same issue. Effective research requires parallel searching across Latin and English formulations and across both nominative (*animus*) and ablative (*animo*) forms.
Historical Dictionary Support
Black's (both editions) and Burrill are in close agreement: all three sources define *animo* as "with the intention, disposition, design, will" and treat it as a term that derives meaning from its companions. The entries are largely catalogues of the compound phrases rather than analyses of the term itself, reflecting how practitioners of the period actually used it — always in combination, never in isolation.
Burrill adds the most doctrinal texture, quoting Bracton's maxim (*considerandum est quo animo, quave voluntate quid fiat* — "it is to be considered with what intent, or with what will a thing is done") and noting its pervasive presence in the books. This framing reveals that *animo* constructions were not merely translational conveniences but reflected a jurisprudential commitment, drawn from Roman law and transmitted through Bracton, to treating subjective intent as a legally operative fact. The historical dictionaries do not address the term's decline or its displacement by English equivalents — a gap that researchers working in twentieth-century materials must bridge independently.
Jurisdictional Note
*Animo* constructions were adopted across common law jurisdictions drawing on English equity and common law traditions. American courts used them extensively through the nineteenth century. Civil law jurisdictions (Louisiana, Quebec, and their analogues) encountered similar Latin-derived intent language through a different channel — Roman law directly — and may use the same phrases with subtly different doctrinal loading. Researchers working across civil and common law sources should not assume identical meaning.