| 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 |
| 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 |
| 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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| 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 |
| 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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