American English

Definition of capital adjective from the Oxford Advanced American Dictionary

     

    capital

     adjective
    adjective
    NAmE//ˈkæpət̮l//
     
     
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    punishment
  1. 1[only before noun] involving punishment by death a capital offense
  2. letter
  3. 2 [only before noun] (of letters of the alphabet) having the form and size used at the beginning of a sentence or a name English is written with a capital “E.” compare lowercase
  4. excellent
  5. 3 (old-fashioned) excellent
  6. Idioms
    with a capital A, B, etc.
     
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    used to emphasize that a word has a stronger meaning than usual in a particular situation He was romantic with a capital R.
See the Oxford Advanced Learner's Dictionary entry: capital