| quad | (noun) a rectangular area surrounded on all sides by buildings | Synonyms: quadrangle |
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| (noun) (printing) a block of type without a raised letter; used for spacing between words or sentences | Synonyms: space |
| (noun) a muscle of the thigh that extends the leg | Synonyms: musculus quadriceps femoris, quadriceps, quadriceps femoris |
| (noun) one of four children born at the same time from the same pregnancy | Synonyms: quadruplet |
| quadrangle | (noun) a rectangular area surrounded on all sides by buildings | Synonyms: quad |
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| (noun) a four-sided polygon | Synonyms: quadrilateral, tetragon |
| quadrant | (noun) a measuring instrument for measuring altitude of heavenly bodies | - |
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| (noun) the area enclosed by two perpendicular radii of a circle | - |
| (noun) any of the four areas into which a plane is divided by two orthogonal coordinate axes | - |
| (noun) a quarter of the circumference of a circle | Synonyms: quarter-circle |
| quadrantanopia | (noun) blindness in one fourth of the visual field | - |
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| quadraphony | (noun) a stereophonic sound recording or reproducing system using four separate channels | Synonyms: quadraphonic system, quadriphonic system |
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| quadrate | (noun) a square-shaped object | - |
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| (noun) a cubelike object | - |
| quadratic | (noun) a polynomial of the second degree | Synonyms: quadratic polynomial |
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| (noun) an equation in which the highest power of an unknown quantity is a square | Synonyms: quadratic equation |
| quadratics | (noun) a branch of algebra dealing with quadratic equations | - |
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| quadrature | (noun) the construction of a square having the same area as some other figure | - |
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| quadrennium | (noun) a period of four years | - |
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| quadric | (noun) a curve or surface whose equation (in Cartesian coordinates) is of the second degree | Synonyms: quadric surface |
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| quadriceps | (noun) a muscle of the thigh that extends the leg | Synonyms: musculus quadriceps femoris, quad, quadriceps femoris |
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| quadrilateral | (noun) a four-sided polygon | Synonyms: quadrangle, tetragon |
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| quadrille | (noun) a square dance of 5 or more figures for 4 or more couples | - |
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| (noun) music for dancing the quadrille | - |
| quadrillion | (noun) the number that is represented as a one followed by 15 zeros | - |
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| (noun) the number that is represented as a one followed by 24 zeros in the UK | - |
| quadrillionth | (noun) one part in a quadrillion equal parts | Synonyms: one-quadrillionth |
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| quadripara | (noun) (obstetrics) woman who has given birth to a viable infant in each of four pregnancies | - |
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| quadriplegia | (noun) paralysis of both arms and both legs | - |
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| quadriplegic | (noun) a person who is paralyzed in both arms and both legs | - |
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| quadrivium | (noun) (Middle Ages) a higher division of the curriculum in a medieval university involving arithmetic and music and geometry and astronomy | - |
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| quadroon | (noun) an offspring of a mulatto and a white parent; a person who is one-quarter black | - |
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| quadrumvirate | (noun) a group of four men | - |
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| quadruped | (noun) an animal especially a mammal having four limbs specialized for walking | - |
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| quadruple | (noun) a quantity that is four times as great as another | - |
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| (noun) a set of four similar things considered as a unit | Synonyms: quadruplet, quartet, quartette |
| quadruplet | (noun) a set of four similar things considered as a unit | Synonyms: quadruple, quartet, quartette |
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| (noun) one of four children born at the same time from the same pregnancy | Synonyms: quad |
| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quartet, quatern, quaternary, quaternion, quaternity, tetrad |
| quadruplicate | (noun) any four copies; any of four things that correspond to one another exactly | - |
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| quadrupling | (noun) increase by a factor of four | - |
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