| acquaintance | (noun) personal knowledge or information about someone or something | Synonyms: conversance, conversancy, familiarity |
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| (noun) a person with whom you are acquainted | Synonyms: friend |
| (noun) a relationship less intimate than friendship | Synonyms: acquaintanceship |
| acquaintanceship | (noun) a relationship less intimate than friendship | Synonyms: acquaintance |
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| adequacy | (noun) the quality of being able to meet a need satisfactorily: | Synonyms: adequateness |
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| (noun) the quality of being sufficient for the end in view | Synonyms: sufficiency |
| adequateness | (noun) the quality of being able to meet a need satisfactorily: | Synonyms: adequacy |
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| aliquant | (noun) an integer that is not an exact divisor of some quantity | Synonyms: aliquant part |
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| antiquarian | (noun) an expert or collector of antiquities | Synonyms: antiquary, archaist |
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| antiquark | (noun) the antiparticle of a quark | - |
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| antiquary | (noun) an expert or collector of antiquities | Synonyms: antiquarian, archaist |
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| antiquatedness | (noun) The state or quality of being outmoded or discredited by reason of age, of being out of style or fashion. | - |
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| aqua | (noun) a shade of blue tinged with green | Synonyms: aquamarine, cobalt blue, greenish blue, peacock blue, turquoise |
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| aquaculture | (noun) rearing aquatic animals or cultivating aquatic plants for food | - |
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| aqualung | (noun) a device (trade name Aqua-Lung) that lets divers breathe under water; scuba is an acronym for self-contained underwater breathing apparatus | Synonyms: Aqua-Lung, scuba |
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| aquamarine | (noun) a shade of blue tinged with green | Synonyms: aqua, cobalt blue, greenish blue, peacock blue, turquoise |
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| (noun) a transparent variety of beryl that is blue green in color | - |
| aquanaut | (noun) an underwater swimmer equipped with a face mask and foot fins and either a snorkel or an air cylinder | Synonyms: skin-diver |
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| (noun) a skilled worker who can live in underwater installations and participate in scientific research | Synonyms: oceanaut |
| aquaphobia | (noun) a morbid fear of drowning | - |
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| aquaplane | (noun) a board that is pulled by a speedboat as a person stands on it and skims over the top of the water | - |
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| aquarium | (noun) a tank or pool or bowl filled with water for keeping live fish and underwater animals | Synonyms: fish tank, marine museum |
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| aquatic | (noun) a plant that lives in or on water | - |
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| aquatics | (noun) sports that involve bodies of water | Synonyms: water sport |
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| aquatint | (noun) a method of etching that imitates the broad washes of a water color | - |
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| (noun) an etching made by a process that makes it resemble a water color | - |
| aquavit | (noun) Scandinavian liquor usually flavored with caraway seeds | Synonyms: akvavit |
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| biquadrate | (noun) an algebraic equation or function of the fourth degree | Synonyms: biquadratic, fourth power, quartic |
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| biquadratic | (noun) a polynomial of the fourth degree | Synonyms: biquadratic polynomial, quartic polynomial |
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| (noun) an equation of the fourth degree | Synonyms: biquadratic equation |
| (noun) an algebraic equation or function of the fourth degree | Synonyms: biquadrate, fourth power, quartic |
| chinquapin | (noun) small nut of either of two small chestnut trees of the southern United States; resembles a hazelnut | Synonyms: chincapin, chinkapin |
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| (noun) shrubby chestnut tree of southeastern United States having small edible nuts | Synonyms: Allegheny chinkapin, Castanea pumila, dwarf chestnut, eastern chinquapin |
| (noun) shrubby tree closely related to the Allegheny chinkapin but with larger leaves; southern midwestern United States | Synonyms: Castanea ozarkensis, Ozark chinkapin, Ozark chinquapin |
| cumquat | (noun) any of several trees or shrubs of the genus Fortunella bearing small orange-colored edible fruits with thick sweet-flavored skin and sour pulp | Synonyms: kumquat, kumquat tree |
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| demisemiquaver | (noun) a musical note having the time value of a thirty-second of a whole note | Synonyms: thirty-second note |
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| desquamation | (noun) loss of bits of outer skin by peeling or shedding or coming off in scales | Synonyms: peeling, shedding |
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| diddlysquat | (noun) a small worthless amount | Synonyms: diddley, diddly-shit, diddly-squat, diddly, diddlyshit, doodly-squat, jack, shit, squat |
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| disqualification | (noun) the act of preventing someone from participating by finding them unqualified | - |
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| (noun) unfitness that bars you from participation | - |
| earthquake | (noun) shaking and vibration at the surface of the earth resulting from underground movement along a fault plane or from volcanic activity | Synonyms: quake, seism, temblor |
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| (noun) a disturbance that is extremely disruptive | - |
| equal | (noun) a person who is of equal standing with another in a group | Synonyms: compeer, match, peer |
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| equalisation | (noun) the act of making equal or uniform | Synonyms: equalization, leveling |
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| equaliser | (noun) a weight that balances another weight | Synonyms: balance, counterbalance, counterpoise, counterweight, equalizer |
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| (noun) electronic equipment that reduces frequency distortion | Synonyms: equalizer |
| equalitarian | (noun) a person who believes in the equality of all people | Synonyms: egalitarian |
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| equalitarianism | (noun) the doctrine of the equality of mankind and the desirability of political and economic and social equality | Synonyms: egalitarianism |
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| equality | (noun) the quality of being the same in quantity or measure or value or status | - |
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| (noun) a state of being essentially equal or equivalent; equally balanced | Synonyms: equation, equivalence, par |
| equalization | (noun) the act of making equal or uniform | Synonyms: equalisation, leveling |
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| equalizer | (noun) a score that makes the match even | - |
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| (noun) a weight that balances another weight | Synonyms: balance, counterbalance, counterpoise, counterweight, equaliser |
| (noun) electronic equipment that reduces frequency distortion | Synonyms: equaliser |
| equanimity | (noun) steadiness of mind under stress | Synonyms: calm, calmness, composure |
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| equatability | (noun) capability of being equated | - |
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| equating | (noun) the act of regarding as equal | Synonyms: equation |
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| equation | (noun) the act of regarding as equal | Synonyms: equating |
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| (noun) a mathematical statement that two expressions are equal | - |
| (noun) a state of being essentially equal or equivalent; equally balanced | Synonyms: equality, equivalence, par |
| equator | (noun) an imaginary line around the Earth forming the great circle that is equidistant from the north and south poles | - |
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| (noun) a circle dividing a sphere or other surface into two usually equal and symmetrical parts | - |
| equatorial | (noun) a telescope whose mounting has only two axes of motion, one parallel to the Earth's axis and the other one at right angles to it | - |
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| forequarter | (noun) the front half of a side of meat | - |
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| foursquare | (noun) (geometry) a plane rectangle with four equal sides and four right angles; a four-sided regular polygon | Synonyms: square |
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| headquarters | (noun) the military installation from which a commander performs the functions of command | Synonyms: HQ, military headquarters |
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| (noun) (usually plural) the office that serves as the administrative center of an enterprise | Synonyms: central office, home base, home office, main office |
| (noun) (plural) a military unit consisting of a commander and the headquarters staff | - |
| hemidemisemiquaver | (noun) a musical note having the time value of a sixty-fourth of a whole note | Synonyms: sixty-fourth note |
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| hindquarter | (noun) the back half of a side of meat | - |
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| hindquarters | (noun) the part of an animal that corresponds to the human buttocks | Synonyms: croup, croupe, rump |
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| (noun) the fleshy part of the human body that you sit on | Synonyms: arse, ass, backside, behind, bottom, bum, buns, butt, buttocks, can, derriere, fanny, fundament, hind end, keister, nates, posterior, prat, rear, rear end, rump, seat, stern, tail, tail end, tooshie, tush |
| inadequacy | (noun) unsatisfactoriness by virtue of being inadequate | Synonyms: inadequateness |
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| (noun) lack of an adequate quantity or number | Synonyms: deficiency, insufficiency |
| (noun) a lack of competence | Synonyms: insufficiency |
| inadequateness | (noun) unsatisfactoriness by virtue of being inadequate | Synonyms: inadequacy |
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| inequality | (noun) lack of equality | - |
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| jacquard | (noun) a highly figured fabric woven on a Jacquard loom | - |
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| kumquat | (noun) small oval citrus fruit with thin sweet rind and very acid pulp | - |
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| (noun) any of several trees or shrubs of the genus Fortunella bearing small orange-colored edible fruits with thick sweet-flavored skin and sour pulp | Synonyms: cumquat, kumquat tree |
| loquaciousness | (noun) the quality of being wordy and talkative | Synonyms: garrulity, garrulousness, loquacity, talkativeness |
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| loquacity | (noun) the quality of being wordy and talkative | Synonyms: garrulity, garrulousness, loquaciousness, talkativeness |
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| loquat | (noun) yellow olive-sized semitropical fruit with a large free stone and relatively little flesh; used for jellies | Synonyms: Japanese plum |
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| (noun) evergreen tree of warm regions having fuzzy yellow olive-sized fruit with a large free stone; native to China and Japan | Synonyms: Eriobotrya japonica, Japanese medlar, Japanese plum, loquat tree |
| methaqualone | (noun) sedative-hypnotic drug (trade name Quaalude) that is a drug of abuse | Synonyms: Quaalude |
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| musquash | (noun) beaver-like aquatic rodent of North America with dark glossy brown fur | Synonyms: muskrat, Ondatra zibethica |
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| paraquat | (noun) a poisonous yellow solid used in solution as a herbicide | - |
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| piquance | (noun) a tart spicy quality | Synonyms: nip, piquancy, piquantness, tang, tanginess, zest |
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| (noun) the quality of being agreeably stimulating or mentally exciting | Synonyms: piquancy, piquantness |
| piquancy | (noun) a tart spicy quality | Synonyms: nip, piquance, piquantness, tang, tanginess, zest |
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| (noun) the quality of being agreeably stimulating or mentally exciting | Synonyms: piquance, piquantness |
| piquantness | (noun) a tart spicy quality | Synonyms: nip, piquance, piquancy, tang, tanginess, zest |
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| (noun) the quality of being agreeably stimulating or mentally exciting | Synonyms: piquance, piquancy |
| quack | (noun) the harsh sound of a duck | - |
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| (noun) an untrained person who pretends to be a physician and who dispenses medical advice | - |
| quackery | (noun) medical practice and advice based on observation and experience in ignorance of scientific findings | Synonyms: empiricism |
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| (noun) the dishonesty of a charlatan | Synonyms: charlatanism |
| quackgrass | (noun) European grass spreading rapidly by creeping rhizomes; naturalized in North America as a weed | Synonyms: Agropyron repens, couch grass, dog grass, quack grass, quick grass, witch grass, witchgrass |
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| 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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| quaestor | (noun) any of several public officials of ancient Rome (usually in charge of finance and administration) | - |
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| quaff | (noun) a hearty draft | - |
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| quaffer | (noun) a person who drinks heartily | - |
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| quag | (noun) a soft wet area of low-lying land that sinks underfoot | Synonyms: mire, morass, quagmire, slack |
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| quagga | (noun) mammal of South Africa that resembled a zebra; extinct since late 19th century | Synonyms: Equus quagga |
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| quagmire | (noun) a soft wet area of low-lying land that sinks underfoot | Synonyms: mire, morass, quag, slack |
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