Adjective peak has 2 senses
  1. peak - of a period of maximal use or demand or activity; "at peak hours the streets traffic is unbelievable"
    off-peak, off-season
  2. highest, peak - approaching or constituting a maximum; "maximal temperature"; "maximum speed"; "working at peak efficiency"
    Antonyms: minimal, minimum (indirect, via maximal, maximum)
    Antonyms: minimal, minimum (indirect, via maximal, maximum)
,Noun peak has 7 senses
  1. extremum, peak - the most extreme possible amount or value; "voltage peak"
    --1 is a kind of limit, limitation
    --1 has particulars: minimum, lower limit; maximum, upper limit
    Derived form: verb peak1
  2. flower, prime, peak, heyday, bloom, blossom, efflorescence, flush - the period of greatest prosperity or productivity
    --2 is a kind of time period, period of time, period
    --2 has particulars: golden age
  3. acme, height, elevation, peak, pinnacle, summit, superlative, top - the highest level or degree attainable; "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"
    --3 is a kind of degree, level, stage, point
    Derived form: verb peak1
  4. 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"
    --4 is a kind of topographic point, place, spot
    --4 has particulars: hilltop, brow; pinnacle; mountain peak
  5. point, tip, peak - a V shape; "the cannibal's teeth were filed to sharp points"
    --5 is a kind of convex shape, convexity
    --5 is a part of
     cone, conoid, cone shape; alpenstock; sword, blade, brand, steel; pencil; arrowhead; knife
    --5 has particulars: widow's peak; cusp; head
  6. vertex, peak, apex, acme - the highest point (of something); "at the peak of the pyramid"
    --6 is a kind of extreme point, extreme, extremum
    --6 has particulars: crown; roof peak
  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"
    --7 is a kind of brim
    --7 is a part of
     baseball cap, jockey cap, golf cap; kepi, peaked cap, service cap, yachting cap
,Verb peak has 1 sense
  1. peak - to reach the highest point; attain maximum intensity, activity; "That wild, speculative spirit peaked in 1929"
    --1 is one way to
    reach, make, attain, hit, arrive at, gain
    Derived forms: noun peak3, noun peak1
    Sample sentences:
    Something ----s
    Something is ----ing PP