Definition of double adjective from the Oxford Advanced Learner's Dictionary

      

    double

     adjective
    adjective
    BrE BrE//ˈdʌbl//
     
    ; NAmE NAmE//ˈdʌbl//
     
    [usually before noun]
     
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    twice as much/many
  1. 1  twice as much or as many as usual a double helping two double whiskies
  2. with two parts
  3. 2  having or made of two things or parts that are equal or similar double doors a double-page advertisement ‘Otter’ is spelt with a double t. My extension is two four double 0 (2400).
  4. for two people
  5. 3  made for two people or things a double bed/room Which Word?double / dualThese adjectives are frequently used with the following nouns: double bed/​doors/​figures/​standards/​thickness dual purpose/​function/​role/​approach/​citizenship Dual describes something that has two parts, uses or aspects. Double can be used with a similar meaning, but when it is used to describe something that has two parts, the two parts are usually the same or very similar. Double, but not dual, can describe something that is made for two people or things, or is twice as big as usual. compare single
  6. combining two things
  7. 4  combining two things or qualities a double meaning/purpose/aim It has the double advantage of being both easy and cheap.
  8. Word Origin Middle English: via Old French from Latin duplus, from duo ‘two’ The verb is from Old French dobler, from late Latin duplare, from duplus.
See the Oxford Advanced American Dictionary entry: double