What does rēspūblica mean in Latin?

rēspūblica, a noun, means “a republic, commonwealth; the state, nation; politics, civil affairs”.

What is the genitive of rēspūblica?

The genitive singular is reīpūblicae. rēspūblica is feminine, fifth declension.

In classical Latin, [reːsˈpuː.blɪ.ka]; in ecclesiastical (church) Latin, [resˈpuː.bli.ka].

noun · femininefifth declension

rēspūblica f (genitive reīpūblicae)

Classical[reːsˈpuː.blɪ.ka]Ecclesiastical[resˈpuː.bli.ka]

a republic, commonwealth; the state, nation
Tacitus, Annals Book XIII, 45In that same year a profligacy no less infamous caused the beginning of tremendous iniquities to the republic.
O di immortales, ubinam gentium sumus? Quam rem publicam habemus? In qua urbe vivimus?.O ye immortal gods, where on earth are we? What is the government we have? In what city are we living?63 BCE, Cicero, Catiline Orations:
politics, civil affairs

declension
form	singular	plural
nominative	rēspūblica	rēspūblicae rēs pūblicae
genitive	reīpūblicae reī pūblicae	rērumpūblicārum rērum pūblicārum
dative	reīpūblicae reī pūblicae	rēbuspūblicīs rēbus pūblicīs
accusative	rempūblicam rem pūblicam	rēspūblicās rēs pūblicās
ablative	rēpūblicā rē pūblicā	rēbuspūblicīs rēbus pūblicīs
vocative	rēspūblica	rēspūblicae rēs pūblicae

honoribus ac reipublicae muneribus perfunctus (De Or. 1. 45): a man who has held many offices.

respublĭca, v. res, II. K.

Univerbation of rēs + pūblica, literally “public interest”. Compare English commonwealth.

Elsewhere

Conlangs