Longman Dictionary of Contemporary English homepage

peak

3 adjective
     
peak3 [only before noun]
1 used to talk about the best, highest, or greatest level or amount of something:
Gasoline prices are 14% below the peak level they hit in November.
a shampoo designed to keep your hair in peak condition
If you phone during the day you pay the peak rate for calls.
periods of peak demand for electricity
2 British English the peak time or period is when the greatest number of people are doing the same thing, using the same service etc:
Extra buses run at peak times.
Hotel prices rise during the peak season.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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