LATIN DICTIONARYLexicon Latīnum
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“activity” in Latin

The English word activity itself goes back to Latin agō, through activitas.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

activity
opera (activity, unemphatically; opposed to momentary inactivity, or merely thinking, talking, or advising): labor (labor, toil): industria (habitual activity of an elevated kind; e.g., in heroes, statesmen): navitas (the useful activity of ordinary men): sedulitas (bustling activity in small matters): assiduitas (persevering industry): diligentia (careful, close application): impigritas (unweariedness): actio (acting). Agility, pernicitas (activity and dexterity in all bodily movements): agilitas (opposed to tarditas).

Quick answer

What is the Latin word for activity?
The usual Latin words for “activity” are opus, labor, industria; also nāvitās, sēdulitās, assiduitās. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.