Sacrum Romanum Imperium

• SRI, S.R.I., S. R. I. (initialisms)

• (Classical Latin) IPA^(key): [ˈsa.krũː roːˈmaː.nũː ɪmˈpɛ.ri.ũː]
• (modern Italianate Ecclesiastical) IPA^(key): [ˈsaː.krum roˈmaː.num imˈpɛː.ri.um]

Sacrum Rōmānum Imperium n sg (genitive Sacrī Rōmānī Imperiī); second declension

1. (Medieval Latin) Holy Roman Empire (a former polity and medieval empire forming a loose conglomeration of largely independent mostly Germanic entities in Central Europe from at least 962 C.E. until 1806)

Also found simply as Rōmānum Imperium, as in the Praefatio to Saxo Grammaticus' Gesta Danorum.

Second-declension adjective with a second-declension adjective with a second-declension noun (neuter), singular only.