Sacrament n. : The oath of allegiance taken by Roman soldiers; hence, a sacred ceremony used to impress an obligation; a solemn oath-taking; an oath.

Sacrament n. : The pledge or token of an oath or solemn covenant; a sacred thing; a mystery.

Sacrament n. : 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.

Sacrament v. t. : To bind by an oath.

Example:
What is the origin of the Sacrament of Penance or aka Reconciliation?

Taxonomy
sacraments, Baptism, the Church, ordinance, God, rites, The Sacraments, Concordia Publishing, Publishing House, Graebner, Augustus, Saint Louis, MO, grace, denominations, Christ, churches, the Lord's Supper, the seven sacraments.

Defination from the web:
Sacraments are usually administered by the clergy to a recipient.