| quarterdeck | (noun) the stern area of a ship's upper deck | - |
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| quarterfinal | (noun) one of the four competitions in an elimination tournament whose winners go on to play in the semifinals | - |
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| quartering | (noun) dividing into four equal parts | - |
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| (noun) living accommodations (especially those assigned to military personnel) | - |
| (noun) a coat of arms that occupies one quarter of an escutcheon; combining four coats of arms on one shield usually represented intermarriages | - |
| quarterlight | (noun) car window consisting of a small pivoted glass vent in the door of a car | - |
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| quarterly | (adjective) of or relating to or consisting of a quarter | - |
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| (noun) a periodical that is published every quarter (or four issues per year) | - |
| (adverb) in three month intervals | Synonyms: every quarter |
| (adverb) in diagonally opposed quarters of an escutcheon | - |
| quartermaster | (noun) an army officer who provides clothing and subsistence for troops | - |
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| quartern | (noun) one of four equal parts | Synonyms: fourth, fourth part, one-fourth, one-quarter, quarter, twenty-five percent |
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| quarters | (noun) housing available for people to live in | Synonyms: living quarters |
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| quarterstaff | (noun) a long stout staff used as a weapon | - |
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| quartervine | (noun) woody flowering vine of southern United States; stems show a cross in transverse section | Synonyms: Bignonia capreolata, cross vine, quarter-vine, trumpet flower |
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| quartet | (noun) a musical composition for four performers | Synonyms: quartette |
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| (noun) four people considered as a unit | Synonyms: foursome, quartette |
| (noun) a set of four similar things considered as a unit | Synonyms: quadruple, quadruplet, quartette |
| (noun) four performers or singers who perform together | Synonyms: quartette |
| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quadruplet, quatern, quaternary, quaternion, quaternity, tetrad |
| quartette | (noun) a musical composition for four performers | Synonyms: quartet |
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| (noun) four people considered as a unit | Synonyms: foursome, quartet |
| (noun) a set of four similar things considered as a unit | Synonyms: quadruple, quadruplet, quartet |
| (noun) four performers or singers who perform together | Synonyms: quartet |
| quartic | (noun) an algebraic equation or function of the fourth degree | Synonyms: biquadrate, biquadratic, fourth power |
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| quartile | (noun) (statistics) any of three points that divide an ordered distribution into four parts each containing one quarter of the scores | - |
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| quarto | (noun) the size of a book whose pages are made by folding a sheet of paper twice to form four leaves | Synonyms: 4to |
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| quartz | (noun) a hard glossy mineral consisting of silicon dioxide in crystal form; present in most rocks (especially sandstone and granite); yellow sand is quartz with iron oxide impurities | - |
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| (noun) colorless glass made of almost pure silica | Synonyms: crystal, lechatelierite, quartz glass, vitreous silica |
| quartzite | (noun) hard metamorphic rock consisting essentially of interlocking quartz crystals | - |
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| quartzose | (adjective) relating to or made of quartz | - |
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| quasar | (noun) a starlike object that may send out radio waves and other forms of energy; many have large red shifts | Synonyms: quasi-stellar radio source |
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| quash | (verb) put down by force or intimidation | Synonyms: keep down, reduce, repress, subdue, subjugate |
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| (verb) declare invalid | Synonyms: annul, avoid, invalidate, nullify, void |
| quasi | (adjective) having some resemblance | - |
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| quasiparticle | (noun) a quantum of energy (in a crystal lattice or other system) that has position and momentum and can in some respects be regarded as a particle | - |
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| quassia | (noun) handsome South American shrub or small tree having bright scarlet flowers and yielding a valuable fine-grained yellowish wood; yields the bitter drug quassia from its wood and bark | Synonyms: bitterwood, Quassia amara |
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| (noun) a bitter compound used as an insecticide and tonic and vermifuge; extracted from the wood and bark of trees of the genera Quassia and Picrasma | - |
| quat | (noun) the leaves of the shrub Catha edulis which are chewed like tobacco or used to make tea; has the effect of a euphoric stimulant | Synonyms: African tea, Arabian tea, cat, kat, khat, qat |
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| quatercentenary | (noun) the 400th anniversary (or the celebration of it) | Synonyms: quatercentennial |
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| quatercentennial | (noun) the 400th anniversary (or the celebration of it) | Synonyms: quatercentenary |
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| quatern | (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quadruplet, quartet, quaternary, quaternion, quaternity, tetrad |
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| quaternary | (adjective) consisting of or especially arranged in sets of four | Synonyms: quaternate |
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| (adjective) coming next after the third and just before the fifth in position or time or degree or magnitude | Synonyms: 4th, fourth |
| (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quadruplet, quartet, quatern, quaternion, quaternity, tetrad |
| quaternate | (adjective) consisting of or especially arranged in sets of four | Synonyms: quaternary |
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| quaternion | (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quadruplet, quartet, quatern, quaternary, quaternity, tetrad |
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| quaternity | (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quadruplet, quartet, quatern, quaternary, quaternion, tetrad |
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| quatrain | (noun) a stanza of four lines | - |
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| quattrocento | (noun) the 15th century in Italian art and literature | - |
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| quaver | (noun) a musical note having the time value of an eighth of a whole note | Synonyms: eighth note |
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| (noun) a tremulous sound | - |
| (verb) sing or play with trills, alternating with the half note above or below | Synonyms: trill, warble |
| (verb) give off unsteady sounds, alternating in amplitude or frequency | Synonyms: waver |
| quavering | (adjective) (of the voice) quivering as from weakness or fear | Synonyms: tremulous |
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| quaveringly | (adverb) in an unsteady quavering manner | - |
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| quay | (noun) wharf usually built parallel to the shoreline | - |
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| quayage | (noun) a fee charged for the use of a wharf or quay | Synonyms: wharfage |
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