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Shrillness is a factor upon which a frequency is determined. It is a type of frequency along with pitch.
(wÄ«n, hwÄ«n) v. whined, whinÂ·ing, whines. v.intr. 1. To produce a sustained, high-pitched, plaintive sound, as in pain, fear, or complaint. 2. To complain or protest in a childish or annoying fashion: fans who are always whining about the poor officiating. 3. To produce a sustained noise of high pitch: jet engines whining.