Definition of peak noun from the Oxford Advanced American Dictionary

      

    peak

     noun
    noun
    NAmE//pik//
     
     
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  1. 1 [usually singular] the point when someone or something is best, most successful, strongest, etc. synonym height Traffic reaches its peak between 8 and 9 in the morning. She's at the peak of her career. a boxer well past his peak the peaks and valleys of married life Membership of the club has fallen from a peak of 600 people in 2006. compare off-peak
  2. 2the pointed top of a mountain; a mountain with a pointed top a mountain peak snow-capped/jagged peaks The climbers made camp halfway up the peak.
  3. 3any narrow and pointed shape, edge, etc. Whisk the egg whites into stiff peaks. He combed his hair into a peak.
See the Oxford Advanced Learner's Dictionary entry: peak