early 13c., originally in the Christian sense, from Old French salvaciun, from Late Latin salvationem (nominative salvatio, a Church Latin translation of Greek soteria), noun of action from salvare "to save" (see save). In general (non-religious) sense, attested from late 14c. Meaning "source of salvation" is from late 14c. Salvation Army is from 1878, founded by the Rev. William Booth. The verb salve "to save from loss at sea" (1706) is a back-formation.