LATIN DICTIONARYLexicon Latīnum
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“serenity” in Latin

The English word serenity itself goes back to Latin serēnus, through serēnitās.

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

serenity
serenitas (only PROP.): hilaritas (gayety). Imperturbable serenity of disposition, *immota animi tranquillitas. Vid: also, the adjective

Quick answer

What is the Latin word for serenity?
The usual Latin words for “serenity” are serēnitās, hilaritās. 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.