What is the meaning of Sacer?

sacred, holy, dedicated (to a divinity), consecrated, hallowed

devoted (to a divinity for sacrifice), fated (to destruction), forfeited, accursed

divine, celestial

execrable, detestable, horrible, infamous; criminal, impious, wicked, abominable, cursed

sacred, holy, suitable to be sacrificed (found especially as an adjective applying to the noun porcus)

Source: wiktionary.org