Merriam-Webster Collegiate Dictionary - acre

 I. geographical name state W Brazil bordering on Peru & Bolivia capital Rio Branco area 59,343 square miles (153,698 square kilometers), population 417,437  II. geographical name  or Hebrew ‘Akko or Old Testament Accho or New Testament Ptolemais city & port NW Israel N of Mt. Carmel population 37,400 ACRE  noun  Etymology: Middle English, from Old English ?cer; akin to Old High German ackar field, Latin ager, Greek agros, and perhaps to Latin agere to drive — more at agent  Date: before 12th century  1.  a. archaic a field especially of arable land or pastureland  b. plural lands, estate  2. any of various units of area; specifically a unit in the United States and England equal to 43,560 square feet (4047 square meters) — see weight table  3. a broad expanse or great quantity ~s of free publicity