(British spelling) A standard unit of area equal to the area of a square whose sides are one metre long (that is, an area one meter square) Symbol: m²

(mathematics) An n-by-n arrangement of n different integers such that each row, each column and each of the two diagonals contains each of the integers once and once only.

(idiomatic) To finish, complete, tidy or put in order. / (nautical) To square the ship's yards to make her run before the wind, with the wind blowing straight from the stern.

(games) A palindromic square word arrangement, usually in the form of a magic amulet.

(idiomatic) The place where one begins; a lack of progress.

(mathematics) A matrix having the same number of rows as columns.

a square in Westminster; the site of Nelson's Column, National Gallery and frequent demonstrations

the City of London

(nautical) A square-rigged ship.

(nautical, of a ship) Having (approximately) square sails rigged onto spars perpendicular to the keel. / Smartly dressed.