| dual | (adjective) consisting of or involving two parts or components usually in pairs | Synonyms: double, duple |
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| (adjective) a grammatical number category referring to two items or units as opposed to one item (singular) or more than two items (plural) | - |
| (adjective) having more than one decidedly dissimilar aspects or qualities | Synonyms: double, three-fold, threefold, treble, two-fold, twofold |
| gradual | (adjective) proceeding in small stages | - |
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| (adjective) (of a topographical gradient) not steep or abrupt | - |
| (noun) (Roman Catholic Church) an antiphon (usually from the Book of Psalms) immediately after the epistle at Mass | - |
| individual | (adjective) being or characteristic of a single thing or person | Synonyms: single |
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| (adjective) separate and distinct from others of the same kind | Synonyms: case-by-case, item-by-item |
| (adjective) concerning one person exclusively | Synonyms: private |
| (adjective) characteristic of or meant for a single person or thing | Synonyms: single |
| (noun) a human being; person, singular, assertive existential pronoun; pronoun, person, singular; quantifier: assertive existential | Synonyms: mortal, person, somebody, someone, soul |
| (noun) a single organism | - |
| residual | (adjective) relating to or indicating a remainder | Synonyms: residuary |
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| (noun) (often plural) a payment that is made to a performer or writer or director of a television show or commercial that is paid for every repeat showing | - |
| (noun) something left after other parts have been taken away | Synonyms: balance, remainder, residue, residuum, rest |