regnis
regnis is a Latin form of regnum, meaning “kingship, royal power; rule; kingdom, realm”. It is the ablative plural neuter noun.
Found 98 times in the Latin texts on Socratos.
Where it is used
Cicero, De Imperio Cn. Pompei Ad Quirites 64: … ingularis sed aliae quoque animi virtutes magnae et multae requiruntur. difficile est in Asia, Cilicia, Syria regnisque interiorum nationum ita versari nostrum imperatorem ut nihil aliud nisi de hoste ac de laude cogitet. dein …
All forms of regnum (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.