Enthusiasm is intense enjoyment, interest, or approval.

The word "enthusiastic" was originally used to refer to a person possessed by a god. It comes from the Greek word ἐνθουσιασμός from ἐν and θεός and οὐσία, meaning "possessed by [a] god's essence", applied by the Greeks to manifestations of divine possession, by Apollo (as in the case of the Pythia), or by Dionysus (as in the case of the Bacchantes and Maenads), the term enthusiasm was also used in a transferred or figurative sense. Socrates taught that the inspiration of poets is a form of enthusiasm. The term was confined to a belief in religious inspiration, or to intense religious fervour or emotion.