Etymology
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hypnosis (n.)

1850, "the coming on of sleep," coined (as an alternative to hypnotism) from hypno- "sleep" + -osis "condition." But the distinction was not sustained, and by 1876 hypnosis was being used of artificially induced conditions.

updated on September 14, 2020

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Definitions of hypnosis from WordNet

hypnosis (n.)
a state that resembles sleep but that is induced by suggestion;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.