Webster's English Dictionary

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fourth

Cross references:
  1. number                

fourth \'fo-(*)rth, 'fo.(*)rth\ n 2a: the musical interval embracing four 
   diatonic degrees 2b: SUBDOMINANT 2c: the harmonic combination of two tones 
   a fourth apart 3: the 4th forward gear or speed of a motor vehicle cap  4: 
   INDEPENDENCE DAY - fourth ajor ;av