Definitions
1.nounThe person or thing in the fifth position.
2.nounOne of five equal parts of a whole.
3.nounThe fifth gear of an engine.
4.nounA quantity of liquor equal to one-fifth of a gallon, or, more commonly, 750 milliliters (that is, three quarters of a liter).
5.nounThe musical interval between one note and another seven semitones higher (the fifth note in the major/minor scale)
6.nounThe fifth voice in a polyphonic melody.