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Shrillness is a factor upon which a frequency is determined. It is a type of frequency along with pitch.
Here are all the possible meanings and translations of the word irrationality. Princeton's WordNet(0.00 / 0 votes)Rate this definition: Wiktionary(0.00 / 0 votes)Rate this definition: irrationality(Noun) The quality or state of being irrational; want of the faculty or the quality of reason; fatuity.