passionate infatuation with or enthusiasm for something; a craze or temporary intense interest.
From French engouement (noun form of engouement), derived from engoué. The French suffix -ment creates an abstract noun, and this word was borrowed into English to describe the quality of being infatuated.
The French language has this wonderful word for a specific kind of temporary passionate obsession, and when English writers wanted to express that particular flavor of temporary madness (like the sudden craze for collecting certain items), they borrowed it directly rather than trying to invent a new term.
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