fifth > define

noun

• A quantity of liquor equal to one fifth of a United States gallon.
• Position five in a countable series of things.
  • usage: "he was fifth out of several hundred runners"
• One part in five equal parts.
  • synonyms: one-fifth, fifth part, twenty percent
• The musical interval between one note and another five notes away from it.

adjective

• Coming next after the fourth and just before the sixth in position.
  • synonyms: 5th

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