Source : Webster's Revised Unabridged Dictionary (1913)

Acre \A"cre\, n. [OE. aker, AS. [ae]cer; akin to OS. accar, OHG.
   achar, Ger. acker, Icel. akr, Sw. [*a]ker, Dan. ager, Goth.
   akrs, L. ager, Gr. ?, Skr. ajra. [root]2, 206.]
   1. Any field of arable or pasture land. [Obs.]

   2. A piece of land, containing 160 square rods, or 4,840
      square yards, or 43,560 square feet. This is the English
      statute acre. That of the United States is the same. The
      Scotch acre was about 1.26 of the English, and the Irish
      1.62 of the English.

   Note: The acre was limited to its present definite quantity
         by statutes of Edward I., Edward III., and Henry VIII.

   {Broad acres}, many acres, much landed estate. [Rhetorical]
      

   {God's acre}, God's field; the churchyard.

            I like that ancient Saxon phrase, which calls The
            burial ground, God's acre.            --Longfellow.

Source : WordNet®

acre
     n 1: a unit of area (4840 square yards) used in English-speaking
          countries
     2: a territory of western Brazil bordering on Bolivia and Peru
     3: a town and port in northwestern Israel in the eastern
        Mediterranean [syn: {Akko}, {Akka}, {Accho}]