dual - definition, thesaurus and related words from WordNet-Online

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Adjective dual has 3 senses

double, dual, duple - consisting of or involving two parts or components usually in pairs; "an egg with a double yolk"; "a double (binary) star"; "double doors"; "dual controls for pilot and copilot"; "duple (or double) time consists of two (or a multiple of two) beats to a measure"
Antonym: single (indirect, via multiple)
double, dual, twofold, treble, threefold - having more than one decidedly dissimilar aspects or qualities; "a double (or dual) role for an actor"; "the office of a clergyman is twofold; public preaching and private influence"- R.W.Emerson; "every episode has its double and treble meaning"-Frederick Harrison
Antonym: single (indirect, via multiple)
dual - a grammatical number category referring to two items or units as opposed to one item (singular) or more than two items (plural); "ancient Greek had the dual form but it has merged with the plural form in modern Greek"
Antonym: singular (indirect, via plural)