Definition of sanity noun from the Oxford Advanced American Dictionary

     

    sanity

     noun
    noun
    NAmE//ˈsænət̮i//
     
    [uncountable]
     
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  1. 1the state of having a normal healthy mind His behavior was so strange that I began to doubt his sanity. to keep/preserve your sanity
  2. 2the state of being sensible and reasonable After a series of road accidents the police pleaded for sanity among drivers. opposite insanity see also sane
See the Oxford Advanced Learner's Dictionary entry: sanity