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“accident” in Latin

The English word accident itself goes back to Latin ad, through accidēns.

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

accident
accidental occurrence, casus, res fortuita. Generally to be translated by verb: it was an accident, casu factum est. By accident, forte (by chance; without particular stress on the chance): casu (by chance: opposed to consulto): fortuito, fortuitu (by mere chance: opposed to causa). (The words are found in this connection and order), casu et fortuitu or fortuito; temere (without previous reflection; implying that it would not have been done with it): forte fortuna, (by a lucky chance). To trust to the chapter of accidents, rem in casum ancipitis eventus committere (to trust anything to chance): casum potius quam consilium sequi (to trust to chance rather than counsel). It happened by accident, etc., forte evenit ut; casu accidit ut; forte ita incidit ut. To mention anything by accident, in mentionem alicujus rei incidere.
Accidents = non-essential properties, accidentia, plur. (rerum, etc., Quint., τὰ συμβεβηκότα.)

Quick answer

What is the Latin word for accident?
The usual Latin words for “accident” are cāsus, accidēns, fortis; also cadō, fortuītus, temere. 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.