regni

Regni is the genitive singular form of the Latin noun regnum, meaning kingdom, realm, or sovereignty. It appears in Latin phrases to express possession, such as Regni Dei, “the kingdom of God.” The noun regnum comes from the verb regere, to rule, and is related to rex, king.

Regnum is a neuter noun of the second declension. Its principal forms are nom. sing. regnum; gen. sing. regni; dat. sing. regno; acc. sing. regnum; abl. sing. regno; nom. plur. regna; gen. plur. regnorum; dat. plur. regnis; acc. plur. regna; abl. plur. regnis. Thus, regni is the genitive singular form.

Usage: In classical Latin, regnum denotes the domain of a ruler or the sovereignty of a state. In religious texts it is used for the Kingdom of God or the Kingdom of Heaven (Regnum Dei, Regnum caelorum). In medieval and ecclesiastical Latin the term retained these senses of realm and rule.

In taxonomy, Regnum is the Latin term for the rank of kingdom, the highest traditional level in the Linnaean system. Examples include Regnum Animalia and Regnum Plantae. Contemporary classifications may use different frameworks, but Regnum remains a standard label in traditional scientific writing.

See also: reign, kingdom, taxonomy.