Webster's English Dictionary

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fifty

Cross references:
  1. number                
 
fif.ty \'fif-te-\ n [ME, fr. fifty, adj., fr. OE fi-ftig, fr. fi-ftig, 
   n.,]group of 50, fr. fi-f five - -tig group of ten - more at EIGHTY pl  2: 
   the numbers 50 to 59; specif : the years 50 to 59 in a lifetime  or history 
   - fifty ajor ;pn