What does factum mean?
A factum is, at root, a thing done: an act, deed, or event. The word comes directly from Latin factum, the neuter past participle of facere, meaning "to do" or "to make," making it a sibling of the everyday English word "fact." In modern usage, factum survives almost exclusively in legal contexts. Most prominently in Canadian practice, a factum is the formal written document submitted to an appellate court that states the facts of a case and sets out a party's legal arguments — the counterpart of what American lawyers call a brief. In discussions of Roman and civil law, factum retains its older sense of an act or deed from which legal consequences flow. Because of its specialized character, the word carries a formal, technical connotation and would strike most general readers as obscure. Its plural is facta, and it is best reserved for legal or scholarly prose.
An act or deed; something done.
"Under Roman law, every legally relevant factum required examination of both intent and consequence."
Chiefly found in historical and legal-scholarly writing.
A written statement of the facts and arguments in a case submitted to a court, especially an appellate court; the standard term for this document in Canadian practice.
"Counsel served the respondent's factum within the deadline set by the rules of court."
Equivalent to an American "brief"; standard in Canadian courts.
The plural follows the Latin neuter pattern, like "data" from "datum."
"The facta submitted by both parties ran to several hundred pages."
Every 'fact' you know descends from the same Latin verb as factum — literally 'a thing done.'
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of factum
Factum comes straight from Latin factum, meaning "a deed" or "something done," the neuter form of the past participle of facere ("to do, to make"). English adopted the term in legal Latin usage, with senses relating to acts and statements of fact attested from around the 16th–17th centuries. It shares its root with a wide family of English words, including "fact," "faction," "manufacture," and "feat," all ultimately tracing back to the Proto-Indo-European root *dʰeh₁-, "to do" or "to set."
Related word forms
How factum is actually used
"Factum" is rare in general English and belongs chiefly to legal register, especially in Canada, where "factum" is the standard term for the written argument equivalent to an American appellate brief. In scholarly writing on Roman law it refers to an act or deed. The plural is "facta." It should not be used casually as a synonym for "fact."
Easily confused with factum
A factor is an agent, element, or contributor to a result, whereas a factum is an act done or a formal statement of the facts in a case.
Fractum (from Latin frangere, to break) relates to something broken and is not a standard English word, while factum derives from facere, to do.