hypnosis /hɪpˈnəʊ.sɪs/ noun3 •A trancelike state, artificially induced, in which a person has a heightened suggestibility, and in which suppressed memories may be experienced.She entered a state of deep hypnosis.The therapy used hypnosis to treat anxiety. •Any of various sleep-like conditions. •The practice of inducing hypnosis; hypnotism. formshypnoses