fifth
Cross references: 1. number fifth \'fif(t)th, 'fift\ \'fifths, 'fif(t)s\ n or fifths pl 2a: the musical interval embracing five diatonic degrees 2b: DOMINANT 2c: the harmonic combination of two tones at this interval 3: a unit of measure for liquor equal to one fifth of a U.S. gallon cap 4: the Fifth Amendment of the U.S. Constitution - fifth ajor ;av