| 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 | - |
| 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 | - |
| 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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