c. 1300, "characterized by vigor or strength; having qualities befitting a knight; valiant, hardy, courageous;" from Old French vertuos "righteous; potent; of good quality; mighty, valiant, brave" (12c.), from Late Latin virtuosus "good, virtuous," from Latin virtus "moral strength, high character, goodness; manliness; valor, bravery, courage (in war); excellence, worth," from vir "man" (from PIE root *wi-ro- "man").

From mid-14c. in English as "having beneficial or efficacious properties;" late 14c. (of persons) as "having excellent moral qualities; conforming to religious law." Related: Virtuously; virtuousness.

1610s, "scholar, connoisseur," from Italian virtuoso (plural virtuosi), noun use of adjective meaning "skilled, learned, of exceptional worth," from Late Latin virtuosus (see virtuous). Meaning "person with great skill, one who is a master of the mechanical part of a fine art" (as in music) is first attested 1743.

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]

*wī-ro-, Proto-Indo-European root meaning "man."

It forms all or part of: curia; Fergus; triumvir; triumvirate; Weltanschauung; Weltschmerz; werewolf; wergeld; world; virago; virile; virility; virtue; virtuosity; virtuoso; virtuous.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit virah, Avestan vira-, Latin vir, Lithuanian vyras, Old Irish fer, Welsh gwr, Gothic wair, Old English wer "a man."