Etymology
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accident (n.)

late 14c., "an occurrence, incident, event; what comes by chance," from Old French accident (12c.), from Latin accidentem (nominative accidens) "an occurrence; chance; misfortune," noun use of present participle of accidere "happen, fall out, fall upon," from ad "to" (see ad-) + combining form of cadere "to fall," from PIE root *kad- "to fall."

The sense has had a tendency since Latin to extend from "something that happens, an event" to "a mishap, an undesirable event." Latin si quid cui accidat, "if anything should happen to one," was a euphemism for "if one should die." In Middle English the word is met usually in theology (in reference to the material qualities in the sacramental bread and wine), medicine ("something out of the ordinary, disease, injury"), or philosophy ("non-essential characteristic of a thing").

From late 15c. as "the operations of chance." Meaning "an unplanned child" is attested by 1932. Accident-prone is from 1926.

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Definitions of accident

accident (n.)
an unfortunate mishap; especially one causing damage or injury;
accident (n.)
anything that happens suddenly or by chance without an apparent cause;
it was due to an accident or fortuity
winning the lottery was a happy accident
Synonyms: stroke / fortuity / chance event
From wordnet.princeton.edu