# Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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 chi-square a statistical method that determines to what degree the differences between expected data and data actually derived can be ascribed to chance, rather than to some general cause or principle. root mean square the square root of the arithmetic mean of the squares in a given set of numbers. square away to put in order; arrange properly. square dance a lively dance in which couples form circles, squares, or other shapes and often execute steps or maneuvers as they are called out by the caller. square deal (informal) a fair, honest arrangement or deal, esp. a commercial transaction. square knot a double knot with the free ends parallel to the standing parts. square measure any system of units for measuring areas in squares, such as square inches or square meters. square root a divisor of a number which, when multiplied by itself, equals that number. square sail a four-sided sail rigged on a yard that is horizontal to the mast and athwart the keel of a sailing vessel. square shooter (informal) one who is fair and honest in dealing with others. square-dance to perform the square dance. square-rigged of a sailing vessel, outfitted with square sails. square-rigger a square-rigged sailing ship. square-shouldered having a posture or build with the shoulders straight across rather than sloping. T square a T-shaped ruler having a short crosspiece that fits over the edge of a drawing board, used by drafters to draw parallel lines. Tiananmen Square an extensive public plaza in central Beijing, China, known widely in connection with the student protests of 1989. try square a device consisting of a ruled straightedge set at right angles to another straightedge, used by carpenters in testing for squareness or marking out right angles. word square a selection of words arranged in a square that reads the same vertically or horizontally.