peakpeak2 adjectiveadj1peak level/price/rate etc the highest level etc something reachesMany Japanese investors bought property at peak prices just before values began to slump.
The company expects to hit peak production in two years’ time.
2peak time/period/hours/season the time when the greatest number of people in a country are doing the same thing, using the same service etcThere are extra trains at peak times.
Hotel prices rise during the peak season.
→ see also off-peak