There are 2 definitions of peak in English:

peak1

Line breaks: peak
Pronunciation: /piːk
 
/

noun

1The pointed top of a mountain: tatters of fog clung to the peak of the mountain
More example sentences
  • It winds up through rolling hills with stands of poplar trees, distant views of lakes and snowy mountain peaks strung along the horizon.
  • The visitor is mesmerized by its sunny beaches, snowy mountain peaks, endless plains where black bulls graze, shimmering lakes and mountain streams.
  • How it ended up on the peak of a snowy mountain (located over a crocodile lake and through a blue tunnel) is a question we'll have to save for another day.
Synonyms
1.1A mountain with a pointed top: he climbed his last Swiss peak at the age of 80
More example sentences
  • The highest peak is Mount Apo in Mindanao at 9,689 feet.
  • The over 100 volcanic peaks in the range, some over 3,000 metres in elevation, include more than a dozen which are considered active.
  • Where the White Mountains come to an end is the great peak of Mount Mindolluin.
Synonyms
mountain, hill, height, alp, aiguille, serac, puy, crag, tor, inselberg; bluff, scarp, escarpment, eminence, prominence, elevation; ridge, range, massif, sierra, cordillera; Scottishben, Munro; South Africanberg; Arabicjebel
archaic mount
2A projecting pointed part or shape: whisk two egg whites to stiff peaks
More example sentences
  • Trim to a triangular shape, leaving the peak as high as possible.
  • Every tree seems to me to be shaped as a peak uniquely designed for the very spot it stands in.
  • The shapes of the peaks are broader and less asymmetric.
2.1British A stiff brim at the front of a cap.
More example sentences
  • Kitted out in his team-issue polo shirt, the peak of his baseball cap shading his outdoor complexion, short sleeves revealing the power in his forearms still.
  • A ponytail of strawberry blond hair hung casually below the reversed peak of her baseball cap.
  • In addition there was a fellow in a brown bowler hat, another in a shapeless cloth cap with a peak, and both added their encouragements, turning to Waistcoat in a laconic collusion.
Synonyms
2.2The narrow part of a ship’s hold at the bow or stern: further storage is found in the bow peak
More example sentences
  • It looked like an ornament, like something at the front peak of a ship, a statue of some sort.
2.3The upper, outer corner of a sail extended by a gaff: [as modifier]: the peak halyard
3The point of highest activity, quality, or achievement: he was at his peak as a cricketer package holiday sales hit a peak of around 12 million
More example sentences
  • But as time passed, he no longer was at his peak, and the quality of his troops declined, while his enemies had learned their lessons.
  • At their peak, cassette sales alone brought in an estimated $50 million annually.
  • At his peak he was almost unstoppable and only the quality of competition limited his Scotland appearances to two.
Synonyms
height, high point/spot, pinnacle, summit, top, highlight, climax, culmination, consummation, epitome, apex, zenith, ascendancy, crowning point, peak of perfection; acme, meridian, apogee, prime, heyday, ne plus ultra, nonpareil, best part, perfection, top form, highest level
3.1A point in a curve or on a graph, or a value of a physical quantity, higher than those around it: a slight increase in velocity provides a second peak on the general velocity curve
More example sentences
  • What happens in all these cases is that a small number of CDs or whatever sell in enormous quantities, forming a peak on the graph.
  • The inset shows the second differential curves calculated from peaks 7 and 8 of the quinone spectra.
  • As expected, loop regions show more motion than helical regions, which is reflected in the larger deviations from the starting point as indicated by peaks in the graph.

verb

[no object, with adverbial] Back to top  
Reach a highest point, either of a specified value or at a specified time: the disease peaked in summer
More example sentences
  • In 1980, the suicide rate in Denmark peaked and reached a level that was among the highest in the world, with 34 suicides per 100 000 inhabitants.
  • Values for vineyards peaked in 2000 in the range of $85,000 to $180,000 per acre, but sales activity in 2003 was virtually nil.
  • Farther out, some see rates peaking at 5.25 per cent in the first half of 2005.
Synonyms
reach its highest point, reach the high point; climax, reach a climax, come to a climax, culminate, reach the zenith, come to a head

adjective

[attributive] Back to top  
1At the highest level; maximum: the canal was restored to peak condition
More example sentences
  • Actually, yes, it is possible to hold a high, but not peak, level of fitness for a long time.
  • PC manufacturers developed state-of-the-art thermal solutions to ensure that notebooks run at the peak performance level under normal conditions.
  • The text is addressed to all performers, athletes, business people, trial lawyers and anyone else who needs guidance on how to work at their peak performance level.
Synonyms
1.1Characterized by maximum activity or demand: traffic speeds are reduced at peak hours
More example sentences
  • The facility's energy strategies will result in a 67 percent reduction in electric energy use during peak demand hours.
  • People will use their cars less as a result, reducing air pollution, decreasing traffic congestion and lessening peak period demands on public transport.
  • The plan also calls on employers to consider introducing flexi-times, so that the effect of the peak demand by traffic on the road network can be diluted.

Origin

mid 16th century: probably a back-formation from peaked, variant of dialect picked 'pointed'.

Usage

The word meaning ‘look quickly or furtively’ and ‘a quick or furtive look’ is peek, not peak. See peek (usage).

Derivatives

peakless

adjective
More example sentences
  • For much of the century the European and American line infantryman wore differing sizes, shapes, and designs of shako, or chaco, an originally peakless, cylindrical, felt hat introduced in Austria in 1769.
  • After averaging, isotropic cells continue to show a peakless angular correlation function during isotropic expansion, confirming that there is no preferred direction of spreading in isotropic cells.

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Word of the day grammarian
Pronunciation: grəˈme(ə)rēən
noun
a person who studies and writes about grammar

There are 2 definitions of peak in English:

peak2

Line breaks: peak
Pronunciation: /piːk
 
/

verb

[no object] archaic
Decline in health and spirits; waste away: she sat all day, peaking and pining, at the fire-side

Origin

early 17th century: of unknown origin.

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