Webster's English Dictionary

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forty

Cross references:
  1. number                
 
for.ty \'fo.rt-e-\ n [ME fourty, adj., fr. OE fe-owertig, fr. fe-owertig 
   gro]up of 40, fr. fe-ower four + -tig group of 10 - more at EIGHTY 2: the 
   third point scored by a side in a game of tennis  pl  3: the numbers 40 to 
   49; specif : the years 40 to 49 in a lifetime  or century - forty ajor ;pn