Definitions
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noun 
  1. A point; the sharp end or top of anything that terminates in a point; as, the peak, or front, of a cap.
  2. (geography) The top, or one of the tops, of a hill, mountain, or range, ending in a point; often, the whole hill or mountain, esp. when isolated; as, the Peak of Teneriffe.
  3. (nautical) The upper aftermost corner of a fore-and-aft sail; -- used in many combinations; as, peak-halyards, peak-brails, etc.
  4. (nautical) The narrow part of a vessel's bow, or the hold within it.
  5. (nautical) The extremity of an anchor fluke; the bill.
  6. (math) For sine waves, the point at which the value of y is at its maximum.
verb (peaks, peaking, peaked)
  1. To reach a peak or maximum.
    • Historians argue about when the Roman Empire began to and ultimately decay.

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