n. An artificial movable joint; a device for joining two pieces in such a manner that one may be turned upon the other; the articulation of a door, gate, shutter, lid, etc., to its support, or of two equally movable parts, as of a fire-screen, to each other.n. A natural movable joint; an anatomical articulation turning in a single plane, as that of the knee or of a bivalve shell. See hinge-joint, and cut under bivalve.n. Figuratively, that on which anything depends or turns; a cardinal or controlling principle, rule, or point.n. One of the cardinal points, north, south, east, or west.n. In entomology, the cardo or basal part of the maxilla. See cut under Insecta.To furnish with hinges; join by means of hinges, literally or figuratively.To bend the hinge or hinges of.Figuratively, to cause to depend: as, to hinge one's acceptance upon some future event.To stand, depend, or turn on or as if on a hinge: chiefly figurative.n. In botany, the flexible lamella of the guard-cells of a stoma which renders them mobile.