What is the origin of the word sacrament?

The Word "sacrament" originates from the Latin term "sacramentum," which means "a sacred thing" or "an oath." In ancient Rome, "sacramentum" referred to a soldier's oath of allegiance, but in Christian theology, it evolved to denote sacred rites that convey divine grace. The term was later adopted in Christian contexts to describe the rites instituted by Christ, such as baptism and the Eucharist.