What is the meaning of peak?

noun

• The most extreme possible amount or value.
  • usage: "voltage peak"
  • synonyms: extremum
• The period of greatest prosperity or productivity.
  • synonyms: flower, prime, heyday, bloom, blossom, efflorescence, flush
• The highest level or degree attainable; the highest stage of development.
  • usage: "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"
  • synonyms: acme, height, elevation, pinnacle, summit, superlative, meridian, tiptop, top
• The top or extreme point of something (usually a mountain or hill. )
  • usage: "the view from the peak was magnificent"; "they clambered to the tip of Monadnock"; "the region is a few molecules wide at the summit"
  • synonyms: crown, crest, top, tip, summit
• A V shape.
  • usage: "the cannibal's teeth were filed to sharp points"
  • synonyms: point, tip
• The highest point (of something. )
  • usage: "at the peak of the pyramid"
  • synonyms: vertex, apex, acme
• A brim that projects to the front to shade the eyes.
  • usage: "he pulled down the bill of his cap and trudged ahead"
  • synonyms: bill, eyeshade, visor, vizor

verb

• To reach the highest point; attain maximum intensity, activity.
  • usage: "That wild, speculative spirit peaked in 1929";"Bids for the painting topped out at $50 million"
  • synonyms: top out