Definition of accidental
(Entry 1 of 2)
1a : occurring unexpectedly or by chance an accidental discovery Their meeting was purely accidental.
b : happening without intent or through carelessness and often with unfortunate results The death was ruled accidental.
3 of a bird : appearing outside its normal geographic range, migration route, or season
Definition of accidental (Entry 2 of 2)
1 : a nonessential property
2a music : a note foreign to a key indicated by a signature
b : a prefixed sign indicating an accidental
3 : a bird found outside its normal geographic range, migration route, or season : vagrant
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