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English definition of “peak”

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peak

noun [C] uk   /piːk/ us  

peak noun [C] (HIGHEST POINT)

B2 the highest, strongest, or best point, value, or level of skill: Holiday flights reach a peak during August. Beat the egg whites until they are stiff enough to form firm peaks. We saw a victory by an athlete at the very peak of her fitness and career.
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peak noun [C] (MOUNTAIN)

B1 the pointed top of a mountain, or the mountain itself: It is one of the most difficult peaks to climb.
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peak noun [C] (HAT PART)

mainly UK ( US usually visor) the flat curved part of a cap that goes above the eyes of the person who is wearing it

peak

adjective [before noun] uk   /piːk/ us  
Peak times are the times when most people are using or doing something: Traffic congestion is really bad at peak periods (= when it is busiest). It is most expensive to advertise at peak viewing times (= those with the most people watching). Don't go there in the peak (= busiest) season - it'll be hot and crowded. Peak levels or rates are when they are at their highest: peak rate electricity

peak

verb [I] uk   /piːk/ us  
to reach the highest, strongest, or best point, value, or level of skill: Official figures show that unemployment peaked in November.
(Definition of peak from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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