Definition of pain noun from the Oxford Advanced American Dictionary

      

    pain

     noun
    noun
    NAmE//peɪn//
     
    see also pains
     
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  1. 1 [uncountable, countable] the feelings that you have in your body when you have been hurt or when you are sick a cry of pain She was clearly in a lot of pain. He felt a sharp pain in his knee. patients suffering from acute back pain stomach/chest pains You get more aches and pains as you get older. The booklet contains information on pain relief during labor. This cream should help to relieve the pain. see also growing pains
  2. 2[uncountable, countable] mental or emotional suffering the pain of separation I never meant to cause her pain. the pleasures and pains of growing old a life full of pain and suffering
  3. Idioms
    no pain, no gain(saying)
     
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    used to say that you need to suffer if you want to achieve something
    on/under pain of something(formal)
     
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    with the threat of having something done to you as a punishment if you do not obey They were required to cut pollution levels, on pain of a $10,000 fine if they disobeyed.
    a pain in the butt/neck(informal)
     
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    a person or thing that is very annoying
See the Oxford Advanced Learner's Dictionary entry: pain