Definition of extreme adjective from the Oxford Advanced American Dictionary

      

    extreme

     adjective
    adjective
    NAmE//ɪkˈstrim//
     
     
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  1. 1 [usually before noun] very great in degree We are working under extreme pressure at the moment. people living in extreme poverty I'm having extreme difficulty not losing my temper with her. The heat in the desert was extreme.
  2. 2not ordinary or usual; serious or severe Children will be removed from their parents only in extreme circumstances. Don't go doing anything extreme like leaving the country. It was the most extreme example of cruelty to animals I had ever seen. extreme weather conditions
  3. 3 (of people, political organizations, opinions, etc.) far from what most people consider to be normal, reasonable, or acceptable extreme left-wing/right-wing views an extreme nationalist organization Their ideas are too extreme for me. opposite moderate
  4. 4 [only before noun] as far as possible from the center, from the beginning, or in the direction mentioned She lives in the extreme west of Tennessee. She sat on the extreme edge of her seat. politicians on the extreme left of the party
See the Oxford Advanced Learner's Dictionary entry: extreme