| 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 |
| cuplike | (adjective) resembling the shape of a cup | - |
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| duplicability | (noun) the quality of being reproducible | Synonyms: reproducibility |
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| duplicable | (adjective) capable of being duplicated | Synonyms: duplicatable |
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| duplicatable | (adjective) capable of being duplicated | Synonyms: duplicable |
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| duplicate | (adjective) being two identical | Synonyms: matching, twin, twinned |
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| (adjective) identically copied from an original | - |
| (noun) a copy that corresponds to an original exactly | Synonyms: duplication |
| (noun) something additional of the same kind | Synonyms: extra |
| (verb) increase twofold | Synonyms: double |
| (verb) make or do or perform again | Synonyms: double, reduplicate, repeat, replicate |
| (verb) make a duplicate or duplicates of | - |
| (verb) duplicate or match | Synonyms: parallel, twin |
| 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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| duplicitous | (adjective) marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another | Synonyms: ambidextrous, deceitful, double-dealing, double-faced, double-tongued, Janus-faced, two-faced |
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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 |
| quadruplicate | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplex |
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| (noun) any four copies; any of four things that correspond to one another exactly | - |
| (verb) reproduce fourfold | - |
| quadrupling | (noun) increase by a factor of four | - |
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| quintupling | (noun) increasing by a factor of five | - |
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| reduplicate | (verb) make or do or perform again | Synonyms: double, duplicate, repeat, replicate |
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| (verb) form by reduplication | Synonyms: geminate |
| 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 |
| 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 |
| (verb) fill with high spirits; fill with optimism | Synonyms: elate, intoxicate, lift up, pick up |
| (verb) lift up or elevate | - |
| (verb) lift up from the earth, as by geologic forces | - |
| uplifted | (adjective) exalted emotionally especially with pride | - |
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| 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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