noun, plural hypnoses [hip-noh-seez] .
an artificially induced trance state resembling sleep, characterized by heightened susceptibility to suggestion.

1875–80; hypn(otic) + -osis

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World English Dictionary
hypnosis (hɪpˈnəʊsɪs)
n , pl -ses
See also autohypnosis an artificially induced state of relaxation and concentration in which deeper parts of the mind become more accessible: used clinically to reduce reaction to pain, to encourage free association, etc

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Word Origin & History

1876, "inducement of sleep," coined (as an alternative to hypnotism) from Gk. hypnos "sleep" (see somnolence) + -osis "condition."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

hypnosis hyp·no·sis (hĭp-nō'sĭs)
n. pl. hyp·no·ses (-sēz)

  1. A trancelike state resembling somnambulism, usually induced by another person, in which the subject may experience forgotten or suppressed memories, hallucinations, and heightened suggestibility.

  2. A sleeplike state or condition.

  3. Hypnotism.

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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
hypnosis   (hĭp-nō'sĭs)  Pronunciation Key 
A trancelike state resembling sleep, usually induced by a therapist by focusing a subject's attention, that heightens the subject's receptivity to suggestion. The uses of hypnosis in medicine and psychology include recovering repressed memories, modifying or eliminating undesirable behavior (such as smoking), and treating certain chronic disorders, such as anxiety.
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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary

hypnosis definition

Placing persons in a drowsy, sleeplike state in which they allegedly become vulnerable to the suggestions made by the hypnotist. Hypnosis may also be used to tap into the unconscious and is often characterized by vivid recall of memories and fantasies. These properties make hypnosis a useful tool in psychotherapy. Hypnosis also has sinister implications, for subjects may be manipulated to perform embarrassing actions or be susceptible to carrying out the hypnotist's commands after the hypnosis session (posthypnotic suggestion).

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
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Example sentences
Hypnosis has an excellent outcome for phantom limb pain, faster and easier than other therapy.
Doctors say hypnosis can help patients undergoing medical procedures feel more relaxed and in control.
Lugosi has to do is to look at people and they either get hypnosis or cramps from laughing.
Hypnosis works better than medicines for treating many things including anxiety and phobias.
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