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  1. the quality of being unchanging or unwavering, as in purpose, love, or loyalty; firmness of mind; faithfulness.
  2. uniformity or regularity, as in qualities or conditions; invariableness.
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Origin of constancy

From the Latin word constantia, dating back to 1520–30. See constant, -ancy


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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for constancy

Contemporary Examples

Historical Examples

  • And this constancy forms the very essence of necessity, nor have we any other idea of it.

  • The necessity of dying created all the constancy of philosophers.


    Francois Duc De La Rochefoucauld

  • Clearly their constancy to this metre was not the result of any technical deficiency.

    The Lyric

    John Drinkwater

  • The constancy of his companions braced Madden like a dash of ice water.

  • All depends on the completeness and constancy with which the make-believe is supported.

    The Mystery of Murray Davenport

    Robert Neilson Stephens

British Dictionary definitions for constancy


  1. the quality of having a resolute mind, purpose, or affection; steadfastness
  2. freedom from change or variation; stability
  3. psychol the perceptual phenomenon in which attributes of an object appear to remain the same in a variety of different presentations, e.g., a given object looks roughly the same size regardless of its distance from the observer
  4. ecology the frequency of occurrence of a particular species in sample plots from a plant community
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for constancy


1520s, from constance + -cy.

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Online Etymology Dictionary, © 2010 Douglas Harper