Webster's English Dictionary

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sixth

Cross references:
  1. number                
 
sixth \'siks(t)th, 'sikst\ \'siks(ts), 'siks(t)ths\ n or sixths pl  2a: a 
   musical interval embracing six diatonic degrees  2b: SUBMEDIANT  2c: the 
   harmonic combination of two tones a sixth apart  - sixth ajor ;av