Noun
sacramentum (plural sacramenta)
(historical) An Ancient Roman oath or vow that rendered the swearer "given to the gods", in the negative sense if he violated it.
All prospective gladiators, whether volunteer or condemned, were bound to service by a sacred oath ( sacramentum ). Source: Internet
The legionaries were paid by the Imperial treasury, and swore an annual military oath of loyalty to the emperor ( sacramentum ). citation The death of an emperor led to a crucial period of uncertainty and crisis. Source: Internet
The recruit got the military status only after the oath of allegiance ("sacramentum"), at the end of "probatio", so that from the legal point of view the "signaculum" was given to a subject who was no more a civilian, but not yet a military. Source: Internet
The term is derived from the Latin word sacramentum, which was used to translate the Greek word for mystery. Source: Internet