sacrament

Latin sacramentum appears in Roman legal and military life before it became a church word. In the first century BCE and first century CE, it named a sum pledged in court and the oath sworn by a soldier. The noun was built from sacrare, "to make sacred," from sacer, "holy, set apart." What was bound by sacramentum was not private feeling but a public act under sacred sanction.

A major turn came in late antiquity when Christian Latin writers adopted sacramentum to translate Greek mysterion. Tertullian, writing in Carthage around 200 CE, used it for sacred rites and revealed truths. The old force of binding obligation did not vanish; it was redirected into baptism, Eucharist, and the church's holy signs. A Roman word of pledge became a Christian word of grace.

From Latin the word passed into Old French as sacrement and into Anglo-French after the Norman period. Middle English records sacrament from the thirteenth century in forms such as sacrement and sacrament. In English it named both the Eucharist in particular and the church's sacred rites more broadly. Medieval theology then fixed the term in debates over how many sacraments there were and what they did.

Modern English keeps the church meaning most strongly, though the older sense of solemn obligation still flickers beneath it. Roman law, Christian translation, and medieval doctrine all remain audible in one compact word. The history is not a drift away from the sacred but a narrowing toward specific holy rites. Sacrament has kept the idea that what is named here is set apart and binding.