• 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"
• 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 me
• 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"-Frederic

'Dual' in other languages