A religious ceremony or act in certain Christian churches regarded as an outward and visible sign of inward divine grace (e.g., baptism, the Eucharist).

The priest administered the sacrament of baptism to the newborn.

The consecrated elements of the Eucharist, especially the bread and wine.

After Mass, the faithful knelt in silence before the sacrament displayed on the altar.

(archaic) A solemn oath or pledge; a sacred promise.

The legionaries took a sacrament before marching into battle.

sacramentadjective

Used attributively before another noun to denote relation to the Christian sacrament of the Eucharist or to a specific sacrament.

She attended the weekly sacrament meeting with her family.