Meaning of “peak” - Learner’s Dictionary

peak

noun [ C ] uk us /piːk/
HIGHEST LEVEL

B2 the highest level or value of something:

Here we see an athlete at the peak of fitness.
The price of gold reached its peak during the last recession.
peak travel times
MOUNTAIN TOP

B1 the top of a mountain, or the mountain itself:

snow-covered/mountain peaks

(Definition of “peak noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)