| coupled | (adjective) connected by a link, as railway cars or trailer trucks | Synonyms: joined, linked |
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| (adjective) joined together especially in a pair or pairs | Synonyms: conjugate, conjugated |
| duple | (adjective) consisting of or involving two parts or components usually in pairs | Synonyms: double, dual |
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| duplex | (adjective) allowing communication in opposite directions simultaneously | - |
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| (adjective) (used technically of a device or process) having two parts | - |
| nonuple | (adjective) having nine units or components | Synonyms: nine-fold, ninefold |
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| octuple | (adjective) having eight units or components | Synonyms: eight-fold, eightfold |
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| quadruple | (adjective) four times as great or many | Synonyms: four-fold, fourfold |
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| (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruplex, quadruplicate |
| quadruplex | (adjective) having four units or components | Synonyms: four-fold, fourfold, quadruple, quadruplicate |
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| quintuple | (adjective) having five units or components | Synonyms: five-fold, fivefold |
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| septuple | (adjective) having seven units or components | Synonyms: seven-fold, sevenfold |
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| sextuple | (adjective) having six units or components | Synonyms: six-fold, sixfold |
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| uncoupled | (adjective) having the coupling undone | - |
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