n. In geometry: A triad of points.n. A triad of systoms of orthogonal surfaces.Consisting of three; threefold; characterized by a subdivision into three parts or into threes: as, a triple knot; a triple window.Three times repeated; treble.Being one of three; third.A league between France, Great Britain, and the Netherlands, formed in 1717, and directed chiefly against Spain. After the accession to it of Austria in 1718 it was known as the Quadruple Alliance.An alliance between Germany, Austria-Hungary, and Italy, formed about 1883, and designed to check Russia and also France. It is chiefly the creation of Prince Bismarck, and by its provisions the three powers are bound to support one another in certain contingencies. Its influence has succeeded to that of the League of the Three Emperors (the German, Austrian, and Russian), which was also largely the creation of Bismarck.A bearing representing three royal or imperial crowns set one upon another in pale. Such a bearing, having also clouds at the base, forms part of the arms of the London Drapers' Company.n. In music, same as treble.n. plural In change-ringing, changes rung on seven bells.To make threefold or thrice as much or as many; treble.To be thrice as great or as many as.To alter from single or double to triple action, as a single or double expansion-engine into a triple expansion-engine; fit up with triple expansion-engines, as a vessel which has previously used a single or double expansion-engine.To increase threefold.