What does peak mean?
Peak refers to the highest point of a mountain, object, trend, or process. As a noun, it can mean a mountain summit, the pointed top of a roof or garment, or the maximum level reached by something such as demand, prices, interest, or performance. As a verb, to peak means to reach a highest level, often with the implication that a decline or reduction follows. As an adjective, peak describes something occurring at that maximum level, as in peak season, peak hours, or peak performance. The word is useful because it captures both a physical high point and the turning point of a changing pattern. Its common use in reporting and business also suggests a temporary rather than permanent condition: a peak can be the most intense moment in a cycle, but it is not necessarily its final state.
The highest point of a mountain, object, process, or scale; the maximum level reached in a series of values.
"The peak of the mountain was visible through the clouds."
To reach the highest level in a process or trend, usually before declining.
"Sales peaked in December and then fell in the following quarter."
Of or relating to the highest point or maximum level attained.
"The team delivered its peak performance in the final."
The plural is used for multiple high points, summits, or maximum levels.
"The mountain range has several peaks above three thousand metres."
A peak is the point where 'highest' and 'soon to turn downward' meet.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of peak
English inherited the word in Middle English as peke, a term associated with a pointed top or extremity. Its core sense was a projecting point, which was extended to the summit of a mountain and later to the highest point in a series or process. Forms such as pike, pique, picket, and picot reflect the same broader family of words connected with a point or projection, although their routes into English differ.
Related word forms
How peak is actually used
The noun is standard in British and American English. The verb is especially common in business, news, economics, and performance contexts, where it usually implies that the level later falls; the adjective is often similarly associated with maximum intensity or value.
Easily confused with peak
A peak is the highest point of something, whereas a peek is a quick or secret look at something.