Origin of -ity
From French -ité, from Middle French -ité, from Old French -ete, -eteit (“-ity”), from Latin -itātem, from -itās, from Proto-Indo-European *-it- (suffix). Cognate with Gothic - (-iþa, “-th”), Old High German -ida (“-th”), Old English -þo, -þu, -þ (“-th”). More at -th.
ME -ite < OFr or L: OFr ité < L -itas < -i-, ending of stem, or thematic vowel + -tas, -ty
From Webster's New World College Dictionary, 5th Edition
Middle English -itie from Old French -ite from Latin -itās variant of -tās -ty
From American Heritage Dictionary of the English Language, 5th Edition
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