grandiosity n.

1828 (earlier as a French word in English), from French grandiose "impressive, grand in effect" (18c.), from Italian grandioso (which also was borrowed directly into English as a musical term), from Latin grandis "big" (see grand (adj.)). Related: Grandiosely.

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]