peak

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Related to Peakish: peckish, relentlessly, sobering

peak

1. the pointed summit of a mountain
2. a mountain with a pointed summit
3. 
a. a sharp increase in a physical quantity followed by a sharp decrease
b. the maximum value of this quantity
c. (as modifier): peak voltage
4. 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

peak

[pēk]
(geology)
The conical or pointed top of a hill or mountain.
An individual mountain or hill taken as a whole, used especially when it is isolated or has a pointed, conspicuous summit.
(meteorology)
The point of intersection of the cold and warm fronts of a mature extra-tropical cyclone.
(science and technology)
The maximum instantaneous value of a quantity.