Definition of constancy noun from the Oxford Advanced American Dictionary

      

    constancy

     noun
    noun
    NAmE//ˈkɑnstənsi//
     
    [uncountable](formal)
     
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  1. 1the quality of staying the same and not changing the constancy of temperature inside the plane
  2. 2(approving) the quality of being faithful synonym fidelity He admired her courage and constancy.
See the Oxford Advanced Learner's Dictionary entry: constancy