Webster's English Dictionary

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hypnosis

hyp.no.sis \hip-'no--s*s\ \-'no--.se-z\ n or hyp.no.ses [NL] pl  1: a state 
   that resembles normal sleep but is induced by a hypnotizer whose  
   suggestions are readily accepted by the subject 2: any of various 
   conditions that resemble sleep  3: HYPNOTISM