A plane figure having four equal sides. Something having an equal-sided rectangular form: a square of cloth. A T-shaped or L-shaped instrument for drawing or testing right angles. Mathematics The product obtained when a number or quantity is multiplied by itself: 49 is the square of 7. Games Any of the quadrilateral spaces on a board, as in chess. An open, usually four-sided area at the intersection of two or more streets, often planted with grass and trees for use as a park. A rectangular space enclosed by streets and occupied by buildings; a block. Slang A person who is regarded as dull, rigidly conventional, and out of touch with current trends. Slang A square meal. Often used in the plural: three squares a day. Having four equal sides and four right angles. Forming a right angle. Expressed in units measuring area: square feet. Having a specified length in each of two equal dimensions: a room that is 12 feet square. Having a base that is a square: a square pyramid. Nautical Set at right angles to the mast and keel. Used of the yards of a square-rigged ship. Approximately rectangular and equilateral in cross section: a square house. Characterized by blocklike solidity or sturdiness. Honest; direct: a square answer. Just; equitable: a square deal. Having all accounts settled; even. Sports Even; tied. Slang Rigidly conventional; dull. To cut to a square or rectangular shape. To test for conformity to a desired plane, straight line, or right angle. To mark into squares. Often used with off.