Etymology tree Latin accidō Latin accidēnslbor. Old French accidentbor. Middle English accident English accident First attested in the late 14th century. From Middle English accident, from Old French accident, from Latin accidēns, present active participle of accidō (“happen”); from ad (“to”) + cadō (“fall”). See cadence, case. In the sense “unintended pregnancy”, first attested in 1932.