hyp ‧ no ‧ sis /hɪpˈnəʊsəs, hɪpˈnəʊsɪs $ -ˈnoʊ-/ BrE AmE noun [uncountable]
1 . a state similar to sleep, in which someone’s thoughts and actions can be influenced by someone else
under hypnosis
While under hypnosis, the victim was able to describe her attacker.
2 . the act of producing this state