ETYM Cf. French accidentel, earlier accidental.
1. Occurring or appearing or singled out by chance; SYN. casual, chance.
2. Without intention; especially resulting from heedless action; SYN. inadvertent.
3. Associated by chance and not an integral part;- Frederick W. Robertson.
Music sign indicating that the following note is to be raised or lowered, as a departure from the key signature.
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In music notation, a sharp, flat, or natural sign preceding a note which changes the pitch of the note by a semitone up (sharp), down (flat), or back to normal (natural).
Music written in black-note keys may require the rarer double sharp and double flat signs indicating a change in pitch of a full tone.
adventitious · casual · chance · extrinsic · inadvertent · unintended · unplanned
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