- Old name of a city in modern Israel famed from the Crusades: see Acco.
- A state in northern Brazil, which has Rio Branco as its capital.
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- A unit of surface area (symbol a. or ac.). Originally defined as an area 1 chain (22 yd) by 1 furlong (220 yd), it equals 4,840 square yards or 43,560 square foot, square feet, used for measuring geographical features such as land and bodies of water. If measured as a square it would be approximately 208.71 feet on each side, for 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. Most commonly used to measure land (or things on land, such as the floor of a building, or sports fields), but can also be used to measure the surface area of bodies of water.
- (in plural, colloquial) A large amount (of area).
Translations: Etymology: Old English ícer.
- I like my new house - there"s acres of space!
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