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English definition of “accidental”

accidental

adjective uk   /ˌæk.sɪˈden.təl/ us    /-t̬əl/
B2 happening by chance: Reports suggest that eleven soldiers were killed by accidental fire from their own side. The site was located after the accidental discovery of bones in a field.

accidental

noun [C] uk   /ˌæk.sɪˈden.təl/ us    /-t̬əl/

accidental noun [C] (IN MUSIC)

specialized music a sign showing that there is a temporary change from the key signature (= the set of musical notes that should normally be played for a particular piece of music)

accidental noun [C] (BIRD)

specialized biology a bird that is found in a place where birds of its type are not usually found : You may spot accidentals driven in by the stormy weather.
(Definition of accidental from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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