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Shrillness is a factor upon which a frequency is determined. It is a type of frequency along with pitch.
Define shrill. shrill synonyms, shrill pronunciation, shrill translation, English dictionary definition of shrill. adj. shrillÂ·er , shrillÂ·est 1. High-pitched and piercing in tone or sound: the shrill wail of a siren. 2. Producing a sharp, high-pitched tone or sound: a...