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Latin word sacramentum comes from Proto-Indo-European *seh₂k-
*seh₂k- (Proto-Indo-European)
*sh₂krós (Proto-Indo-European)
*sakros (Proto-Italic)
sacer (Latin)
(only poetic and in post-Augustan prose) Execrable, detestable, horrible, infamous; criminal, impious, wicked, abominable, cursed.. Devoted to a divinity for sacrifice, fated to destruction, forfeited, accursed.. Divine, celestial.. Sacred, holy, dedicated to a divinity, consecrated, hallowed (translating Greek ἱερός).
sacro (Latin)
(by extension) I render imperishable, deify, immortalize. (of a deity) I hold, worship or honor as sacred. I declare or set apart as sacred; consecrate, dedicate, hallow or devote; sanctify, enshrine. I doom or devote to destruction, declare accursed, condemn.
sacramentum (Latin)
(Ecclesiastical Latin) A mystery, secret.. (Ecclesiastical Latin) Sacrament.. (military) An oath of allegiance.. A sum of money deposited in pledge by two individuals involved in a suit. The money of the loser in the suit was applied to religious purposes.