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Definition of fifth:

  1. Consisting of one of five equal divisions of a thing.
  2. Next in order after the fourth; - the ordinal of five.
  3. The interval of three tones and a semitone, embracing five diatonic degrees of the scale; the dominant of any key.
  4. The quotient of a unit divided by five; one of five equal parts; a fifth part.


fifth part, ordinal, twenty percent, one-fifth, 5th.

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