/ hɪpˈnəʊsɪs; NAmE -ˈnoʊ-/ noun [ U ]
1.
an unconscious state in which sb can still see and hear and can be influenced to follow commands or answer questions :
She only remembered details of the accident under hypnosis .
2.
= hypnotism :
He uses hypnosis as part of the treatment.
Hypnosis helped me give up smoking.
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WORD ORIGIN
late 19th cent.: from Greek hupnos sleep + -osis .