Quick definitions from WordNet (accidental)
▸ noun: a musical notation that makes a note sharp or flat or natural although that is not part of the key signature
▸ adjective: without intention (especially resulting from heedless action) ("Accidental poisoning")
▸ adjective: associated by chance and not an integral part ("Poetry is something to which words are the accidental, not by any means the essential form- Frederick W. Robertson")
▸ adjective: occurring or appearing or singled out by chance ("Their accidental meeting led to a renewal of their friendship")
▸ Also see accidental
▸ noun: a musical notation that makes a note sharp or flat or natural although that is not part of the key signature
▸ adjective: without intention (especially resulting from heedless action) ("Accidental poisoning")
▸ adjective: associated by chance and not an integral part ("Poetry is something to which words are the accidental, not by any means the essential form- Frederick W. Robertson")
▸ adjective: occurring or appearing or singled out by chance ("Their accidental meeting led to a renewal of their friendship")
▸ Also see accidental