(obsolete) Of a person: cunning, crafty. / (obsolete) Cleverly made; artfully contrived. / (now dialectal) Strange or odd; unusual.

(archaic) The vulva.

A swampy, soggy area of ground. / (figuratively) A perilous, mixed up and troubled situation; a hopeless tangle.

(transitive) To embroil (a person, etc.) in complexity or difficulty.

(marketing, retail, logistics, manufacturing) Initialism of quick response. / Ellipsis of QR code. / (medicine) Initialism of quiet room. / (pressure cooking): Initialism of Quick Release.

(US, modern British and Australian, short scale) A thousand trillion (logic: 1,000 × 1,000^4): 1 followed by fifteen zeros, 10¹⁵.

(figuratively, slang, hyperbolic) Any very large number, exceeding normal description.

A quail of North America (of the US-American southwest and the Mexican northwest), Callipepla gambelii.

square-shaped / (mathematics) of a polynomial, involving the second power (square) of a variable but no higher powers, as ax²+bx+c. / (mathematics) of an equation, of the form ax²+bx+c=0.

(mathematics) A quadratic polynomial, function or equation.