What does causae mean?
Causae is the plural form — and also the possessive (genitive) singular — of the Latin noun causa, meaning 'cause', 'reason', or 'ground'. While English has long since absorbed the singular as 'cause', the plural causae survives only in learned settings: legal Latin, medieval philosophy, and scholarly writing that quotes or adapts classical sources. A philosopher discussing Aristotle's four causes might write of the four causae, just as a historian of Roman law might analyse the causae behind a statute. Because it is a foreign grammatical form rather than a fully naturalised English word, writers generally prefer 'causes' in everyday prose and reserve causae for contexts where the Latin terminology carries technical or traditional weight. Its familiarity comes less from standalone use than from its role inside established Latin phrases inherited by Western intellectual life.
nounThe Latin nominative plural and genitive singular of causa ('cause'), used in English chiefly in scholarly, legal, or philosophical contexts when quoting or adapting Latin phrases.
- Plural of causa: multiple causes, grounds, or reasons, especially in Latin quotations or adapted scholarly usage.
- Genitive singular form of causa, appearing in Latin constructions meaning 'of the cause'.
"Medieval philosophers catalogued the causae of natural events with scholastic precision."
"The jurist distinguished among several causae before ruling on the case."
"Aristotelian thinkers held that four causae together explained any natural thing."
Causae itself serves as the plural of the Latin noun causa; further pluralisation does not occur.
"Scholastic writers enumerated many distinct causae for a single effect."
Every English word from 'because' to 'excuse' traces back to one little Roman noun — causa — whose plural, causae, still lurks in law libraries today.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of causae
Causae derives directly from Latin causa, a noun of broad meaning covering cause, reason, motive, and legal case, whose deeper pre-Latin origins remain uncertain. The word passed into Romance languages and, via Old French, into Middle English as 'cause' around the late medieval period, while the Latin forms themselves continued in use in law, theology, and scholastic philosophy. English cognates sharing this root include 'because', 'accuse', and 'excuse', all ultimately built on the same Latin stem.
How causae is actually used
Strictly a Latin form rather than a native English word; it appears almost exclusively in italicised quotations, legal Latin, or historical-philosophical writing, and would normally be replaced by 'causes' in ordinary English prose.
Easily confused with causae
'Causa' is the singular form meaning a single cause, while 'causae' is either its plural or its possessive (genitive) form.