The noun peak has 7 senses (first 4 from tagged texts)
1. (6) extremum, peak -- (the most extreme possible amount or value; "voltage peak")
2. (2) flower, prime, peak, heyday, bloom, blossom, efflorescence, flush -- (the period of greatest prosperity or productivity)
3. (2) acme, height, elevation, peak, pinnacle, summit, superlative, meridian, tiptop, top -- (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")
4. (2) peak, crown, crest, top, tip, summit -- (the top point of a mountain or hill; "the view from the peak was magnificent"; "they clambered to the summit of Monadnock")
5. point, tip, peak -- (a V shape; "the cannibal's teeth were filed to sharp points")
6. vertex, peak, apex, acme -- (the highest point (of something); "at the peak of the pyramid")
7. bill, peak, eyeshade, visor, vizor -- (a brim that projects to the front to shade the eyes; "he pulled down the bill of his cap and trudged ahead")
Overview of verb peak
The verb peak has 1 sense (first 1 from tagged texts)
1. (1) peak -- (to reach the highest point; attain maximum intensity, activity; "That wild, speculative spirit peaked in 1929")
Overview of adj peak
The adj peak has 1 sense (no senses from tagged texts)
1. peak -- (of a period of maximal use or demand or activity; "at peak hours the streets traffic is unbelievable")