Quad"rate (?), a. [L. quadratus squared, p. p. of quadrare to make four-cornered, to make square, to square, to fit, suit, from quadrus square, quattuor four. See Quadrant, and cf. Quadrat, Quarry an arrow, Square.] 1. Having four equal sides, the opposite sides parallel, and four right angles; square.

Figures, some round, some triangle, some quadrate.

Foxe.

2. Produced by multiplying a number by itself; square. " Quadrate and cubical numbers." Sir T. Browne.

3. Square; even; balanced; equal; exact. [Archaic] " A quadrate, solid, wise man." Howell.

4. Squared; suited; correspondent. [Archaic] " A generical description quadrate to both." Harvey.

Quadrate bone(Anat.), a bone between the base of the lower jaw and the skull in most vertebrates below the mammals. In reptiles and birds it articulates the lower jaw with the skull; in mammals it is represented by the malleus or incus.

Quad"rate (?), n. [L. quadratum. See Quadrate, a.] 1. (Geom.) A plane surface with four equal sides and four right angles; a square; hence, figuratively, anything having the outline of a square.

At which command, the powers militant
That stood for heaven, in mighty quadrate joined.

Milton.

2. (Astrol.) An aspect of the heavenly bodies in which they are distant from each other 90°, or the quarter of a circle; quartile. See the Note under Aspect, 6.

3. (Anat.) The quadrate bone.

Quad"rate (?), v. i. [imp. & p. p. Quadrated (?); p. pr. & vb. n. Quadrating.] [See Quadrate, a.] To square; to agree; to suit; to correspond; -- followed by with. [Archaic]

The objections of these speculatists of its forms do not quadrate with their theories.

Burke.

Quad"rate, v. t. To adjust (a gun) on its carriage; also, to train (a gun) for horizontal firing.