fifth Meaning, Definition & Usage

  1. noun a quantity of liquor equal to one fifth of a United States gallon
  2. noun position five in a countable series of things
    • he was fifth out of several hundred runners
  3. noun one part in five equal parts
    one-fifth; fifth part; twenty percent.
  4. noun the musical interval between one note and another five notes away from it
  5. adjective satellite coming next after the fourth and just before the sixth in position
    5th.

WordNet

Fifth adjective
Etymology
OE. fifte, fifthe, AS. fifta. See Five.
Definitions
  1. Next in order after the fourth; -- the ordinal of five.
  2. Consisting of one of five equal divisions of a thing.
Fifth noun
Definitions
  1. The quotient of a unit divided by five; one of five equal parts; a fifth part. a fifth of whiskey = a fifth of a gallon
  2. (Mus.) The interval of three tones and a semitone, embracing five diatonic degrees of the scale; the dominant of any key.

Webster 1913