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Shrillness is a factor upon which a frequency is determined. It is a type of frequency along with pitch.
If you describe a demand, protest, or statement as shrill, you disapprove of it and do not like the strong, forceful way it is said. Shrill voices on both sides of the Atlantic are advocating protectionism. If a bell or whistle shrills, it makes a loud, high-pitched sound. The phone shrilled, making her jump.