Webster's English Dictionary

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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