Meaning of ACCIDENTAL in English
/ 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.
late Middle English : from late Latin accidentalis , from Latin accident- happening from the verb accidere , from ad- towards, to + cadere to fall.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005