peak

1 [peek]
noun
1.
the pointed top of a mountain or ridge.
2.
a mountain with a pointed summit.
3.
the pointed top of anything.
4.
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.
9.
a projecting point: the peak of a man's beard.
11.
a projecting front piece, or visor, of a cap.
12.
Phonetics, nucleus ( def 8a ).
13.
Nautical.
a.
the contracted part of a ship's hull at the bow or the stern.
b.
the upper after corner of a sail that is extended by a gaff. See diag. under sail.
c.
the outer extremity of a gaff.
verb (used without object)
14.
to project in a peak.
15.
to attain a peak of activity, development, popularity, etc.: The artist peaked in the 1950s.
verb (used with object)
16.
Nautical. to raise the after end of (a yard, gaff, etc.) to or toward an angle above the horizontal.
adjective
17.
being at the point of maximum frequency, intensity, use, etc.; busiest or most active: Hotel rooms are most expensive during the peak travel seasons.
18.
constituting the highest or maximum level, volume, etc.; optimal; prime: a machine running at peak performance.

Origin:
1520–30; perhaps < Middle Low German pēk pick, pike

peakless, adjective
peaklike, adjective


2, 4. pinnacle. 4. acme, zenith.


4. abyss, nadir.
Dictionary.com Unabridged

peak

2 [peek]
verb (used without object)
to become weak, thin, and sickly.

Origin:
1500–10; origin uncertain

peakish, adjective
peakishly, adverb
peakishness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
peak (piːk)
 
n
1.  a pointed end, edge, or projection: the peak of a roof
2.  the pointed summit of a mountain
3.  a mountain with a pointed summit
4.  the point of greatest development, strength, etc: the peak of his career
5.  a.  a sharp increase in a physical quantity followed by a sharp decrease: a voltage peak
 b.  the maximum value of this quantity
 c.  (as modifier): peak voltage
6.  Also called: visor a projecting piece on the front of some caps
7.  a.  See widow's peak
 b.  the pointed end of a beard
8.  nautical
 a.  the extreme forward (forepeak) or aft (afterpeak) part of the hull
 b.  (of a fore-and-aft quadrilateral sail) the after uppermost corner
 c.  the after end of a gaff
 
vb
9.  (tr) nautical to set (a gaff) or tilt (oars) vertically
10.  to form or reach or cause to form or reach a peak or maximum
 
adj
11.  of or relating to a period of highest use or demand, as for watching television, commuting, etc: peak viewing hours; peak time
 
[C16: perhaps from pike², influenced by beak1; compare Spanish pico, French pic, Middle Low German pēk]
 
'peaky
 
adj
 
'peakish
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

peak
"pointed top," 1530, variant of pike (2) "sharp point." Meaning "top of a mountain" first recorded 1634, though pike was used in this sense c.1400. Figurative sense is 1784. Meaning "point formed by hair on the forehead" is from 1833. The verb is first recorded 1577, in sense of "to rise in a peak;"
meaning "reach highest point" first recorded 1958. The Peak in Derbyshire is O.E. Peaclond, apparently a reference to elf-denizen Peac "Puck."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for peaking
The backlash against disco among rock loyalists was also peaking.
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