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fifth  audio  (ffth) KEY 

NOUN:
  1. The ordinal number matching the number five in a series.
  2. One of five equal parts.
  3. One fifth of a gallon or four fifths of a quart of liquor.
  4. Music
    1. A tone five degrees above or below a given tone in a diatonic scale.
    2. The interval between two such tones.
    3. The harmonic combination of two such tones.
    4. The dominant of a scale or key.
  5. Fifth The Fifth Amendment. Used with the.

ETYMOLOGY:
Middle English, from Old English ffta; see penkwe in Indo-European roots

OTHER FORMS:
fifth(Adverb)(Adjective), fifthly(Adverb)


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