sacrament

sacrament is a Noun

Definition:

[1] The oath of allegiance taken by Roman soldiers; hence, a sacred ceremony used to impress an obligation; a solemn oath-taking; an oath. [Obs.] I`ll take the sacrament on`t. Shak.

[2] The pledge or token of an oath or solemn cobenant; a sacred thing; a mystery. [Obs.] God sometimes sent a light of fire, and pillar of a cloud . . . and the sacrament of a rainbow, to guide his people through their portion of sorrows. Jer. Taylor.

[3] One of the solemn religious ordinances enjoined by Christ, the head of the Christian church, to be observed by his followers; hence, specifically, the eucharist; the Lord`s Supper.