peak in WordNet English dictionary

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

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