the highest or most important point or level: the peak of her political career.
5.
the maximum point, degree, or volume of anything: Oil prices reached their peak last year.
6.
a time of the day or year when traffic, use, demand, etc., is greatest and charges, fares, or the like are at the maximum: Early evening is the peak on commuter railroads.
7.
the higher fare, charges, etc., during such a period: If you fly during the Christmas holidays, you'll have to pay peak.
8.
Physics.
a.
the maximum value of a quantity during a specified time interval: a voltage peak.
b.
the maximum power consumed or produced by a unit or group of units in a stated period of time.