Definition of accidental adjective from the Oxford Advanced American Dictionary

  

accidental

 adjective
adjective
NAmE//ˌæksəˈdɛntl//
 
 
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 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.
accidentally
 
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NAmE//‑ˈdɛntli//
 
, NAmE//‑ˈdɛntl•i//
 
adverb As I turned around, I accidentally hit him in the face. The damage couldn't have been caused accidentally.
See the Oxford Advanced Learner's Dictionary entry: accidental