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accidental

adjective

  1. happening by chance; fortuitous
  2. belonging but not essential; attributive; incidental
  3. Music of an accidental

noun

  1. a nonessential quality or feature
  2. Music
    1. a sign, as a sharp, flat, or natural, placed before a note to show a change of pitch from that indicated by the key signature
    2. the tone indicated by such a sign

Related Forms:

See accidental in American Heritage Dictionary 4

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