Etymology: < classical Latin quadrātum squared stone, square block, square piece of land, geometric square, square object, (in astronomy) quadrature, in post-classical Latin also square of a number (4th cent. in Augustine), use as noun of neuter singular of quadrātus quadrate adj. Compare Italian quadrato (14th cent.). Compare quadrant n.², quadrat n.With sense 3a compare quadrature n. 3a, and also earlier quarreure n.

Etymology: Apparently a specific application of quadrate n.¹In the form quadrant apparently by association with quadrant n.¹; compare quadrant n.²

Etymology: Variant of quadrant n.¹, by association with quadrate n.¹ Compare quadrant n.²

Etymology: < classical Latin quadrātus square in shape, in post-classical Latin also (of a number) square (6th cent.), use as adjective of past participle of quadrāre quadrate v. Compare Old French, Middle French, French carré quarry adj.¹, Italian quadrato (a1294).

Etymology: < classical Latin quadrāt-, past participial stem (see -ate suffix³) of quadrāre to make square, to quadruple, to accord, fit in, in post-classical Latin also to construct by geometrical means a square equal in area to (a circle or other figure) (13th cent. in British sources), to square (a number or quantity) (15th cent., 1686 in British sources) < quadrum a square, related to quattuor four (see quatuor n.); compare classical Latin quadra a square (see quadra n.). Compare Middle French, French carrer (12th cent. in Old French), Italian quadrare (1308). With sense 2 compare French cadrer , †quadrer to conform, be adapted (to something) (1539 in Middle French with à ; 1672 with avec ). Compare earlier quader v.