Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A unit of area in the U.S. Customary System, used in land and sea floor measurement and equal to 160 square rods, 4,840 square yards, or 43,560 square feet. See Table at measurement.
  • n. Property in the form of land; estate.
  • n. A wide expanse, as of land or other matter. Often used in the plural: "Everything was streaky pink marble and acres of textureless carpeting” ( Anne Tyler).
  • n. Archaic A field or plot of arable land.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A field.
  • n. A unit of surface area (symbol a. or ac.), originally as much as a yoke of oxen could plough in a day; later defined as an area 1 chain (22 yd) by 1 furlong (220 yd), or 4,840 square yards. Equivalent to about 4,046.86 square metres.
  • n. A large amount (of area).

from the GNU version of the Collaborative International Dictionary of English

  • n. Any field of arable or pasture land.
  • n. 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.

from The Century Dictionary and Cyclopedia

  • n. Originally
  • n. A superficial measure of land, usually stated to be 40 poles in length by 4 in breadth; but 160 perches (= 4840 square yards, or 43,560 square feet) make an acre, however shaped.
  • n. A lineal measure equal to a furrow's length, or 40 poles; more frequently, an acre's breadth, 4 poles, equal to 22 or 25 yards.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a territory of western Brazil bordering on Bolivia and Peru
  • n. a town and port in northwestern Israel in the eastern Mediterranean
  • n. a unit of area (4840 square yards) used in English-speaking countries

Etymologies

Middle English aker, field, acre, from Old English æcer; see agro- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Middle English acre, aker, from Old English æcer ("a field, land, that which is sown, sown land, cultivated land; a definite quantitiy of land, land which a yoke of oxen could plough in a day, an acre, a certain quantity of land, strip of plough-land; crop"), from Proto-Germanic *akraz (“field”), from Proto-Indo-European *h₂éǵros (“field”). Cognate with Scots acre, aker, acker ("acre, field, arable land"), North Frisian ecir ("field, a measure of land"), West Frisian eker ("field"), Dutch akker ("field"), German Acker ("field, acre"), Swedish åker ("field"), Icelandic akur ("field"), Latin ager ("land, field, acre, countryside"), Ancient Greek ἀγρός (agros, "field"). Related also to acorn. (Wiktionary)

Examples

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