caritas (n.)

late Old English, "benevolence for the poor," also "Christian love in its highest manifestation," from Old French charité "(Christian) charity, mercy, compassion; alms; charitable foundation" (12c.), from Latin caritatem (nominative caritas) "costliness; esteem, affection," from carus "dear, valued" (from PIE *karo-, from root *ka- "to like, desire").

In the Vulgate the Latin word often is used as translation of Greek agape "love" — especially Christian love of fellow man — perhaps to avoid the sexual suggestion of Latin amor). The Vulgate also sometimes translated agape by Latin dilectio, noun of action from diligere "to esteem highly, to love" (see diligence).

Wyclif and the Rhemish version regularly rendered the Vulgate dilectio by 'love,' caritas by 'charity.' But the 16th c. Eng. versions from Tindale to 1611, while rendering agape sometimes 'love,' sometimes 'charity,' did not follow the dilectio and caritas of the Vulgate, but used 'love' more often (about 86 times), confining 'charity' to 26 passages in the Pauline and certain of the Catholic Epistles (not in I John), and the Apocalypse .... In the Revised Version 1881, 'love' has been substituted in all these instances, so that it now stands as the uniform rendering of agape. [OED]

The general sense of "affections people ought to feel for one another" is from c. 1300. Also from c. 1300 as "an act of kindness or philanthropy," also "alms, that which is bestowed gratuitously on a person or persons in need." The sense of "charitable foundation or institution" in English is attested by 1690s. The meaning "liberality in judging others or their actions" is from late 15c. A charity-school (1680s) educated (and sometimes housed and fed) poor children and was maintained by voluntary contributions or bequests.