“ enthusiasm Look up enthusiasm at Dictionary.com c.1600, from M.Fr. enthousiasme, from Gk. enthousiasmos, from enthousiazein “be inspired,” from entheos “inspired, possessed by a god,” from en- “in” + theos “god” (see Thea). Acquired a derogatory sense of “excessive religious emotion” (1650s) under the Puritans; generalized sense of “fervor, zeal” (the main modern sense) is first recorded 1716.
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