Pertaining to accident and not essence; thus, inessential; incidental; secondary.
Adjusted by one or two semitones, in temporary departure from the key signature.
Occurring sometimes, by chance; occasional.
A property which is not essential; a nonessential; anything happening accidentally.
He conceived it just that accidentals ... should sink with the substance of the accusation.
From Middle English accidental, from Anglo-Norman accidentel, Middle French accidentel, accidental, and their source, Late Latin accidēntālis; corresponding to accident + -al.
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Those fortuitous effects produced by luminous rays falling on certain objects so that some parts stand forth in abnormal brightness and other parts are cast into a deep shadow.
A sharp, flat, or natural, occurring not at the commencement of a piece of music as the signature, but before a particular note.