humanity n.

mid-15c., humain, humaigne, "human," from Old French humain, umain (adj.) "of or belonging to man" (12c.), from Latin humanus "of man, human," also "humane, philanthropic, kind, gentle, polite; learned, refined, civilized." This is in part from PIE *(dh)ghomon-, literally "earthling, earthly being," as opposed to the gods (from root *dhghem- "earth"), but there is no settled explanation of the sound changes involved. Compare Hebrew adam "man," from adamah "ground." Cognate with Old Lithuanian žmuo (accusative žmuni) "man, male person."

Human interest is from 1824. Human rights attested by 1680s; human being by 1690s. Human relations is from 1916; human resources attested by 1907, American English, apparently originally among social Christians and based on natural resources. Human comedy "sum of human activities" translates French comédie humaine (Balzac); see comedy.

1702; plural of humanity (n.), which had been used in English from late 15c. in a sense "class of studies concerned with human culture" (opposed variously and at different times to divinity or sciences). Latin literae humaniores, the "more human studies" (literally "letters") are fondly believed to have been so called because they were those branches of literature (ancient classics, rhetoric, poetry) which tended to humanize or refine by their influence, but the distinction was rather of secular topics as opposed to divine ones (literae divinae).

From the late Middle Ages, the singular word humanity served to distinguish classical studies from natural sciences on one side and sacred studies (divinity) on the other side. ... The term's modern career is not well charted. But by the eighteenth century humanity in its academic sense seems to have fallen out of widespread use, except in Scottish universities (where it meant the study of Latin). Its revival as a plural in the course of the following century apparently arose from a need for a label for the multiple new 'liberal studies' or 'culture studies' entering university curricula. [James Turner, "Philology," 2014]