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1. Oxford American Dictionary

   dual

   • IPA[ˈdo͞oəl]

   美式

   • adj.
     consisting of two parts, elements, or aspects；(in some languages) denoting an inflection that refers to exactly two people or things (as distinct from singular and plural)
   • n.
     a dual form of a word.；the dual number.

   • noun: dual, plural noun: duals

2. • 釋義

   adj.

   形容詞

   • 1. consisting of two parts, elements, or aspects their dual role at work and home
   • ▪ (in some languages) denoting an inflection that refers to exactly two people or things (as distinct from singular and plural) Old English has dual number for first- and second-person pronouns
   • ▪ (in an aircraft) using dual controls a dual flight
   • 2. (of a theorem, expression, etc.) related to another by the interchange of particular pairs of terms, such as “point” and “line.”.

   n.

   名詞

   • 1. a dual form of a word.
   • ▪ the dual number.
   • 2. a theorem, expression, etc., that is dual to another.