/ ˌæksɪˈdentl; NAmE / adjective
happening by chance; not planned :
a verdict of accidental death
I didn't think our meeting was accidental—he must have known I would be there.
► ac·ci·den·tal·ly / -təli; NAmE / adverb :
As I turned around, I accidentally hit him in the face.
The damage couldn't have been caused accidentally.
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WORD ORIGIN
late Middle English : from late Latin accidentalis , from Latin accident- happening from the verb accidere , from ad- towards, to + cadere to fall.