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Definition of enthusiasm : 1. A state of impassioned emotion; transport; elevation of fancy; exaltation of soul; as, the poetry of enthusiasm.
2. Enkindled and kindling fervor of soul; strong excitement of feeling on behalf of a cause or a subject; ardent and imaginative zeal or interest; as, he engaged in his profession with enthusiasm.
3. Inspiration as if by a divine or superhuman power; ecstasy; hence, a conceit of divine possession and revelation, or of being directly subject to some divine impulse.
4. Lively manifestation of joy or zeal.

Synonyms:

fever, heat, extravagance, vitality, zealousness, vivacity, transport, fad, avidity, weariness, craze, furor, devotion, keenness, intensity, exhilaration, feeling, vehemence, impetuosity, inspiration, glow, fanaticism, rapture, ecstasy, alacrity, flare, frenzy, joy, life, concern, go, snap, emotion, ebullience, mania, fury, warmth, rage, zip, interest, pep, feelings, dullness

fervor, ardor, fire

ardency, industriousness, gusto, lustiness, fervency, sprightliness, excitement, passion, liveliness, puissance, verve, energy, zeal, spirit, activity, power, eagerness, zest, relish, earnestness, animation, agility, strength, vigor, potency, vim, exuberance, agitation, friskiness

Usage examples:

• Then he continued hurriedly, with a show of enthusiasm. - "The Crevice", William John Burns and Isabel Ostrander.
• Such was the calm enthusiasm with which he spoke, that Flemming could not choose but listen. - "Hyperion", Henry Wadsworth Longfellow.
• So deep was his earnestness that Mantel seemed to catch his enthusiasm and be convinced. - "The Redemption of David Corson", Charles Frederic Goss.