1.the most extreme possible amount or value;
voltage peak
2.the period of greatest prosperity or productivity
3.the highest level or degree attainable;
his landscapes were deemed the acme of beauty
4.the top point of a mountain or hill;
the view from the peak was magnificent
5.a V shape;
the cannibal's teeth were filed to sharp points
6.the highest point (of something);
at the peak of the pyramid
7.a brim that projects to the front to shade the eyes;
he pulled down the bill of his cap and trudged ahead
8.of a period of maximal use or demand or activity;
at peak hours the streets traffic is unbelievable
9.approaching or constituting a maximum;
maximal temperature
1.to reach the highest point; attain maximum intensity, activity;
That wild, speculative spirit peaked in 1929