Webster's English Dictionary

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twenty

Cross references:
  1. number                
 
twen.ty \'twent-e-\ n [ME, fr. twenty, adj., fr. OE twe-ntig, n., group of 
   20, fr. ]twe-n- (akin to OE twa- two) + -tig group of 10 - more at TWO, 
   EIGHTY pl  2: the numbers 20 to 29 inclusive; specif : the years 20 to 29 
   in a  lifetime or century 3: a twenty-dollar bill  - twenty ajor ;pn