Etymology
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Words related to -ality

-al (1)
suffix forming adjectives from nouns or other adjectives, "of, like, related to, pertaining to," Middle English -al, -el, from French or directly from Latin -alis (see -al (2)).
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-ity 

word-forming element making abstract nouns from adjectives and meaning "condition or quality of being ______," from Middle English -ite, from Old French -ete (Modern French -ité) and directly from Latin -itatem (nominative -itas), suffix denoting state or condition, composed of -i- (from the stem or else a connective) + the common abstract suffix -tas (see -ty (2)).

Roughly, the word in -ity usually means the quality of being what the adjective describes, or concretely an instance of the quality, or collectively all the instances; & the word in -ism means the disposition, or collectively all those who feel it. [Fowler]
continentality (n.)

"condition of being or occupying a continent," 1863, from continent (n.) + -ality. From 1897, a term in meteorology, "measure of the difference between continental and marine climates," from German kontinentalität (1895).

mayoralty (n.)

late 14c., mairaltee "office of a mayor" (mid-15c. as "tenure of a mayor"), from Old French mairalté, from maire (see mayor) + -alte, as in principalte, reformed in English as -alty (see -ality).