Etymology
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enthusiasm (n.)

c. 1600, from French enthousiasme (16c.) and directly from Late Latin enthusiasmus, from Greek enthousiasmos "divine inspiration, enthusiasm (produced by certain kinds of music, etc.)," from enthousiazein "be inspired or possessed by a god, be rapt, be in ecstasy," from entheos "divinely inspired, possessed by a god," from en "in" (see en- (2)) + theos "god" (from PIE root *dhes-, forming words for religious concepts). It acquired a derogatory sense of "excessive religious emotion through the conceit of special revelation from God" (1650s) under the Puritans; generalized meaning "fervor, zeal" (the main modern sense) is first recorded 1716.

Origin and meaning of enthusiasm

updated on October 13, 2021

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Definitions of enthusiasm from WordNet

enthusiasm (n.)
a feeling of excitement;
enthusiasm (n.)
overflowing with eager enjoyment or approval;
Synonyms: exuberance / ebullience
enthusiasm (n.)
a lively interest;
enthusiasm for his program is growing
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.