vt to bind by an oath.
2. sacrament ·noun the pledge or token of an oath or solemn covenant; a sacred thing; a mystery.
3. sacrament ·noun the oath of allegiance taken by roman soldiers; hence, a sacred ceremony used to impress an obligation; a solemn oath-taking; an oath.
4. sacrament ·noun 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.