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

[ Syn: double , duple ]

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

[ Syn: double , twofold , two-fold , treble , threefold , three-fold ]

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'