English Etymology From anharmonic + -ity. Noun anharmonicity (countable and uncountable, plural anharmonicities) (mechanics) The deviation of a system from harmonicity (being a harmonic oscillator) Related terms anharmonic harmonicity inharmonicity Translations deviation of a system from harmonicity Portuguese: anarmonicidade f See also anharmonicity on Wikipedia.Wikipedia Wikiwand - on Seamless Wikipedia browsing. On steroids.