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“rigor” in Latin

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

rigor
In a physical sense, rigor (e.g., of the cold, frigoris): asperitas (roughness, asperity; e.g., of the winter, hiemis): saevitia (e.g., frigoris hiemis, excessive cold).
In a moral sense, severitas rigor: acerbitas: austeritas: saevitia. SYN. in SEVERITY.

Quick answer

What is the Latin word for rigor?
The usual Latin words for “rigor” are rigō, asperitās, saevitia; also acerbitās, austēritās, frīgus. 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.