|Origin:||Perhaps from pike 'mountain, hill' (13-21 centuries), probably from a Scandinavian language|
peak1 W3 [countable]
the time when something or someone is best, greatest, highest, most successful etc
at something's peak
The British Empire was at its peak in the mid 19th century.
Sales this month have reached a new peak.
Most athletes reach their peak in their mid 20s.
He's past his peak as a tennis player.
Oil production is down from its peak of two years ago.
at the peak of something
Hotel rooms are difficult to find at the peak of the holiday season.
the peaks and troughs of the US economy (=high and low points)
the sharply pointed top of a mountain:
snow-capped mountain peaks
a mountain [↪ summit]:
Mount McKinley is Alaska's highest peak.
a part that forms a point above a surface or at the top of something:
Whisk the egg whites until they form stiff peaks.
the flat curved part of a cap that sticks out in front above your eyes [= visor American English]