Meaning of ACCIDENTAL in English
[adjective]Reports suggest that 11 soldiers were killed by accidental fire from their own side.The site was located after the accidental discovery of bones in a field.Accidental death is a verdict (= opinion stated at the end of a trial) that is given when a death was the result of an accident and not of murder or suicide.
Cambridge English vocab. Кембриджский английский словарь. 2012