Complete absorption of attention or interest; the state of being deeply focused on something.
From en- (prefix meaning 'to cause to be') + gross (from Old French gros, meaning 'large'). The term originally referred to buying up goods in bulk, then evolved to mean monopolizing attention.
The word started as a business term for buying up all available goods, but shifted to describe how your mind can be completely 'bought up' or taken over by something interesting—like when you get so focused on a book you forget to eat.
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