LATIN DICTIONARYLexicon Latīnum
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“reign” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

reign s.
regnum (unlimited power in a country, especially that of a monarch; at Rome, after the expulsion of the kings, it denoted despotic rule): imperium (the supreme authority of any commander; at Rome, in the time of the emperors, it denoted their reign; over anybody, in aliquem): dominatio: dominatus (with reference to the unconditional subjection of those over whom the authority extended). To begin his reign, diadema accipere: imperium inire or auspicari (post-Augustan): regnare coepisse: in anybody’s reign, aliquo imperante or regnante: aliquo imperatore or rege: at the beginning of his reign, inter initia regni: in the first year of his reign, eo, quo regnare primum coepit, anno: shortly before the reign of Dionysius, paulo ante, quam regnare coepit Dionysius: the first year of anybody’s reign, primus imperii dies; of my reign, dies imperii mei.
reign v.
PROP., imperium tenere, imperare (general term, to be a sovereign or ruler): summae rerum praeesse (Liv.): sedere ad clavum, ad gubernacula (to be at the head of affairs. ☞ Avoid regere without an object): regnare (especially as a despotic prince). To reign over anybody, alicui imperare: imperium or dominationem habere in aliquem: over a country, imperium alicujus terrae obtinere (☞ dominari in aliquem = to tyrannize over him): the reigning prince, qui nunc praeest civitati; qui nunc est in magistratu: the reigning family, regum domus (domus regnatrix, Tac., Ann., 1, 4).
ImPROP., Vid: RULE.

Quick answer

What is the Latin word for reign?
The usual Latin words for “reign” are rēgnum, imperium, dominātiō; also dominor, auspicor, rēgnō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.