Webster's English Dictionary

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acre

Cross references:
  1. measure               
 
acre \'a--k*r\ n [ME, fr. OE cer; akin to OHG ackar field, L ager, Gk 
   ag]ros, L agere to drive - more at AGENT 1a: archaic : a field esp. of 
   arable or pasture land  1b: pl : LANDS, ESTATE  2: any of various units of 
   area; esp : a unit in the U.S. and Engla nd equal to 160 square rods 3: a 
   broad expanse or great quantity