In a manner that is deeply fascinated, captivated, or put into a trance-like state.
From 'entranced' (past participle of 'entrance,' meaning to put in a trance) + '-ly' (adverb suffix). Rare but poetic formation from the 1800s.
When people watch mesmerizing patterns like the Droste effect or spiraling animations, they're literally entrancedly staring—their brains are being hypnotized by mathematical recursion.
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