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“enthusiasm” in Latin

The English word enthusiasm itself goes back to Latin enthūsiasmus.

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

enthusiasm
inflammatio animi (animorum); divina mentis incitatio et permotio: ardor animi: animi alacritas (Cic.): mens incitata :aestus or fervor ingenii: coelestis quidam mentis instinctus. To be filled with enthusiasm, insurgere; spiritu divino tangi; divino quodam spiritu inflari; divino instinctu concitari: youthful enthusiasm, ardor juvenilis (Cic. uses enthusiasmus in Greek characters).

Quick answer

What is the Latin word for enthusiasm?
The usual Latin words for “enthusiasm” are aestus, animus, īnsurgō. 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.