American English

Definition of only adjective from the Oxford Advanced American Dictionary

      

    only

     adjective
    adjective
    NAmE//ˈoʊnli//
     
    [only before noun]
     
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  1. 1 used to say that no other or others of the same group exist or are there She's their only daughter. We were the only people there. His only answer was a grunt.
  2. 2used to say that someone or something is the best and you would not choose any other She's the only person for the job.
  3. Idioms
    in name only
     
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    officially recognized but not existing in reality He's party leader in name only.
    one and only
     
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    used to emphasize that someone is famous Here he is, the one and only Van Morrison!
    the only thing is… (informal)
     
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    used before mentioning a worry or problem you have with something I'd love to come—the only thing is I might be late.
See the Oxford Advanced Learner's Dictionary entry: only