peak peak /ˈpiːk/

noun

1. () The most extreme possible amount or value  ( extremum , peak )
   the most extreme possible amount or value
    Voltage peak
   voltage peak
   
2. () The top or extreme point of something (usually a mountain or hill)  ( crown , summit , tip , crest , peak , top )
   the top or extreme point of something (usually a mountain or hill)
    The view from the peak was magnificent
   the view from the peak was magnificent
    They clambered to the tip of Monadnock
   they clambered to the tip of Monadnock
    The region is a few molecules wide at the summit
   the region is a few molecules wide at the summit
   
3. () The highest level or degree attainable; the highest stage of development  ( acme , meridian , pinnacle , elevation , peak , summit , superlative , tiptop , top , height )
   the highest level or degree attainable; the highest stage of development
    His landscapes were deemed the acme of beauty
   his landscapes were deemed the acme of beauty
    The artist's gifts are at their acme
   the artist's gifts are at their acme
    At the height of her career
   at the height of her career
    The peak of perfection
   the peak of perfection
    Summer was at its peak
   summer was at its peak
    ...catapulted Einstein to the pinnacle of fame
   ...catapulted Einstein to the pinnacle of fame
    The summit of his ambition
   the summit of his ambition
    So many highest superlatives achieved by man
   so many highest superlatives achieved by man
    At the top of his profession
   at the top of his profession
   
4. () The period of greatest prosperity or productivity  ( bloom , blossom , efflorescence , flower , flush , heyday , peak , prime )
   the period of greatest prosperity or productivity
   
5. A brim that projects to the front to shade the eyes  ( bill , eyeshade , peak , visor , vizor )
   a brim that projects to the front to shade the eyes
    He pulled down the bill of his cap and trudged ahead
   he pulled down the bill of his cap and trudged ahead
   
   
6. The highest point (of something)  ( acme , peak , vertex , apex )
   the highest point (of something)
    At the peak of the pyramid
   at the peak of the pyramid
   
   
7. A V shape  ( peak , tip , point )
   a V shape
    The cannibal's teeth were filed to sharp points
   the cannibal's teeth were filed to sharp points
   

verb

1. () To reach the highest point; attain maximum intensity, activity  ( top out , peak )
   to reach the highest point; attain maximum intensity, activity
    That wild, speculative spirit peaked in 1929
   That wild, speculative spirit peaked in 1929
    Bids for the painting topped out at $50 million
   Bids for the painting topped out at $50 million