Definition of sacraments:
(n) :
(Christianity) A sacred act and the attendant ceremony, considered (theology) an outward sign of divine grace, instituted by Jesus Christ.
(n) :
(in particular) The Eucharist.
(n) :
The consecrated Eucharist (especially the bread).
(n) :
(by extension) Anything regarded as possessing a sacred character or mysterious significance.
(n) :
(Ancient Rome) The oath of allegiance taken by soldiers in Ancient Rome; hence, any sacred ceremony used to impress an obligation; a solemn oath-taking; an oath.
(v) :
(transitive) To bind by an oath.