The state of being captivated, enchanted, or completely absorbed; captivation or fascination.
From 'enthral' plus '-dom' (suffix forming nouns of state or condition, as in kingdom, wisdom). 'Enthral' comes from Old French meaning to enslave, evolving to mean captivation.
The suffix '-dom' usually describes a whole kingdom or domain—so 'enthraldom' is like the entire kingdom of being captured by fascination, a complete mental takeover!
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