Meridian
Part of speech: noun
Definition: An imaginary great circle on the Earth's surface, passing through the geographic poles. Either half of such a great circle, all points of which have the same longitude. A great circle passing through the poles of the celestial sphere and the zenith for a particular observer. A similar line on any general surface of revolution. Any of the longitudinal pathways on the body along which the acupuncture points are distributed. The highest point or state of consciousness and enlightenment achievable by a human.
Part of speech: adjective
Definition: Meridional; relating to a meridian. Relating to noon
Peak
Part of speech: verb
Definition: To reach a highest degree or maximum.
Part of speech: noun
Definition: A point; the sharp end or top of anything that terminates in a point; as, the peak, or front, of a cap.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.The upper aftermost corner of a fore-and-aft sail; -- used in many combinations; as, peak-halyards, peak-brails, etc.The narrow part of a vessel's bow, or the hold within it.The extremity of an anchor fluke; the bill.For sine waves, the point at which the value of y is at its maximum.
Example sentence: Once you get over that peak of puberty, you hit a nice stride.