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   dual

   /ˈdjuːəl/

   adjective

   • 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).
   • ▪ (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’.

   noun

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

   verb

   • 1. convert (a road) into a dual carriageway: British "though there are no plans to dual the road, a public consultation on the A64 is set to start before the end of the year"

   Word Origin late Middle English (as a noun denoting either of the two middle incisor teeth in each jaw): from Latin dualis, from duo ‘two’.

   Derivatives

   • 1. dually adverb

   Scrabble Points: 5

   • D

     2

   • U

     1

   • A

     1

   • L

     1

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