Definition of pinnacle noun from the Oxford Advanced Learner's Dictionary

     

    pinnacle

     noun
    noun
    BrE BrE//ˈpɪnəkl//
     
    ; NAmE NAmE//ˈpɪnəkl//
     
    Mountains and valleys, Architectural features
     
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  1. 1[usually singular] pinnacle of something the most important or successful part of something the pinnacle of her career He spent more than twenty years at the pinnacle of his profession. Formula One is the pinnacle of motor racing. She is at the pinnacle of her profession.
  2. 2a small pointed stone decoration built on the roof of a building We could just make out the pinnacles of the cathedral in the distance. See related entries: Architectural features
  3. 3a high pointed piece of rock, especially at the top of a mountain See related entries: Mountains and valleys
  4. Word Origin Middle English: from Old French, from late Latin pinnaculum, diminutive of pinna ‘wing, point’.
See the Oxford Advanced American Dictionary entry: pinnacle