Definitions from Wiktionary ( )

▸ noun:  (typography, obsolete) Abbreviation of quadrat.
▸ noun:  (letterpress typography) A blank metal block used to fill short lines of type.
▸ noun:  (printing slang) A joke used to fill long days of setting type.
▸ noun:  (typography, phototypesetting and digital typesetting) A keyboard command which aligns text with the left or right margin, or centred between them. In combination, as quad left, quad right, or quad centre.
▸ noun:  (informal) A quadrangle (quadrangular courtyard).
▸ noun:  (colloquial, dated) A horse, from colloquial or humorous quadruped specifically for horse.
▸ noun:  Something that is quadruple (four times) the usual amount, number, etc.
▸ noun:  A poster advertising a cinematic film release, measuring forty by thirty inches, four times the area of crown paper.
▸ noun:  (skating) A quadruple, a jump with four revolutions in the air.
▸ noun:  A serving of four shots of espresso; (attributive) containing four shots of espresso.
▸ noun:  A skate with four wheels.
▸ noun:  Clipping of quadruplet (“a set of four; one of a set of four”).
▸ noun:  (electronics, telecommunications) A group of four insulated wires twisted together to form two circuits of two wires each.
▸ noun:  (radio) A quad antenna, a directional radio antenna consisting of multiple loop antennas.
▸ noun:  (informal) A quadruplet, one of four babies born during the same birth.
▸ noun:  (chess) A kind of round-robin tournament between four players, where each participant plays every other participant once.
▸ noun:  (Mormonism) The Bible, Book of Mormon, Doctrine and Covenants, and Pearl of Great Price bound in a single volume.
▸ noun:  (poker slang, attributive) Of or relating to quads (four of a kind).
▸ noun:  (informal) The quadriceps muscle.
▸ noun:  (informal) Quadruplex videotape.
▸ noun:  (informal) A quadriplegic person.
▸ noun:  A unit of energy equivalent to a quadrillion BTU (10¹⁵ BTU).
▸ noun:  A quad bike.
▸ noun:  (informal, computer graphics) A quadrilateral.
▸ noun:  (informal) A quadcopter.
▸ noun:  (informal) A quadrupel beer.
▸ adjective:  Quadruple, four times the usual size or quantity.
▸ adjective:  (paper) Quadrille, marked with squares.
▸ verb:  (typography, letterpress typography, transitive, intransitive) To fill spaces in a line of type with quads. Also quad out.
▸ verb:  (typography, phototypesetting and digital typesetting, transitive, intransitive) To align text with the left or right margin, or centre it.
▸ verb:  (transitive) To twist four individually insulated conductors together as two pairs of twisted wires that are then twisted together.
▸ verb:  (intransitive) To ride a quad bike.
▸ noun:  (informal) An informal strategic forum between the United States, Japan, Australia, and India, focused on Asian security matters.
▸ noun:  (by extension) A grouping of the United States, Japan, Australia, and India.
▸ noun:  (UK politics, historical) A coalition committee that resolved party disputes during the Cameron–Clegg coalition.

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