dual   (Sound)

The 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"
• 通常ペアで2つの部分または部品に関わるまたはそれらで成る

• double, twofold, dual, threefold, treble, two-fold, three-fold
• 二元的
• 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
• 1つ以上の明らかに異なった局面や品質を持っている

• 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"
• 1つの項目（まれな）か2つ以上の項目（複数の）と対照的に2個の項目かユニットを示す文法的な数のカテゴリ