| aneuploidy | (noun) an abnormality involving a chromosome number that is not an exact multiple of the haploid number (one chromosome set is incomplete) | - |
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| couple | (noun) a pair who associate with one another | Synonyms: duet, duo, twosome |
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| (noun) a pair of people who live together | Synonyms: match, mates |
| (noun) (physics) something joined by two equal and opposite forces that act along parallel lines | - |
| (noun) two items of the same kind | Synonyms: brace, couplet, distich, duad, duet, duo, dyad, pair, span, twain, twosome, yoke |
| (noun) a small indefinite number | - |
| coupler | (noun) a mechanical device that serves to connect the ends of adjacent objects | Synonyms: coupling |
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| couplet | (noun) a stanza consisting of two successive lines of verse; usually rhymed | - |
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| (noun) two items of the same kind | Synonyms: brace, couple, distich, duad, duet, duo, dyad, pair, span, twain, twosome, yoke |
| coupling | (noun) the act of pairing a male and female for reproductive purposes | Synonyms: conjugation, mating, pairing, sexual union, union |
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| (noun) a mechanical device that serves to connect the ends of adjacent objects | Synonyms: coupler |
| (noun) a connection (like a clamp or vise) between two things so they move together | Synonyms: yoke |
| duplex | (noun) an apartment having rooms on two floors that are connected by a staircase | Synonyms: duplex apartment |
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| (noun) a house with two units sharing a common wall | Synonyms: duplex house, semidetached house |
| duplicability | (noun) the quality of being reproducible | Synonyms: reproducibility |
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| duplicate | (noun) a copy that corresponds to an original exactly | Synonyms: duplication |
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| (noun) something additional of the same kind | Synonyms: extra |
| duplication | (noun) the act of copying or making a duplicate (or duplicates) of something | Synonyms: gemination |
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| (noun) a copy that corresponds to an original exactly | Synonyms: duplicate |
| duplicator | (noun) apparatus that makes copies of typed, written or drawn material | Synonyms: copier |
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| duplicity | (noun) acting in bad faith; deception by pretending to entertain one set of intentions while acting under the influence of another | Synonyms: double-dealing |
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| (noun) a fraudulent or duplicitous representation | Synonyms: fraudulence |
| 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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| quintuple | (noun) a set of five similar things considered as a unit | Synonyms: quintet, quintette, quintuplet |
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| quintuplet | (noun) a set of five similar things considered as a unit | Synonyms: quintet, quintette, quintuple |
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| (noun) one of five children born at the same time from the same pregnancy | Synonyms: quin, quint |
| (noun) the cardinal number that is the sum of four and one | Synonyms: 5, cinque, fin, five, fivesome, Little Phoebe, pentad, Phoebe, quint, quintet, V |
| quintupling | (noun) increasing by a factor of five | - |
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| reduplication | (noun) the act of repeating over and again (or an instance thereof) | Synonyms: reiteration |
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| (noun) a word formed by or containing a repeated syllable or speech sound (usually at the beginning of the word) | - |
| (noun) the syllable added in a reduplicated word form | - |
| (noun) repetition of the final words of a sentence or line at the beginning of the next | Synonyms: anadiplosis |
| scruple | (noun) an ethical or moral principle that inhibits action | - |
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| (noun) uneasiness about the fitness of an action (particularly for reasons of ethics, morals or propriety) | Synonyms: misgiving, qualm |
| (noun) a unit of apothecary weight equal to 20 grains | - |
| scruples | (noun) motivation deriving logically from ethical or moral principles that govern a person's thoughts and actions | Synonyms: conscience, moral sense, sense of right and wrong |
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| sextuplet | (noun) the cardinal number that is the sum of five and one | Synonyms: 6, Captain Hicks, half a dozen, hexad, sestet, sextet, sise, six, sixer, VI |
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| thermocouple | (noun) a kind of thermometer consisting of two wires of different metals that are joined at both ends; one junction is at the temperature to be measured and the other is held at a fixed lower temperature; the current generated in the circuit is proportional to the temperature difference | Synonyms: thermocouple junction |
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| upland | (noun) elevated (e.g., mountainous) land | Synonyms: highland |
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| uplift | (noun) a brassiere that lifts and supports the breasts | - |
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| (noun) (geology) a rise of land to a higher elevation (as in the process of mountain building) | Synonyms: upheaval, upthrow, upthrust |
| uplifting | (noun) the rise of something | - |
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| uplink | (noun) a transmission from Earth to a spacecraft or the path of such a transmission | - |
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