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

Origin of constancy

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

Synonyms for constancy

Antonyms for constancy Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for constancy

Contemporary Examples of constancy

  • It conveys the constancy and consistency of the alliance, a special relationship.

    The Daily Beast logo
    Rick Perry's Dangerous Israel Gaffe

    Bruce Riedel

    November 13, 2011

  • She left her son with one place to go: in search of a constancy, a definition he had never known.

    The Daily Beast logo
    Dreams of His Mother

    Stacy Schiff

    May 3, 2011

  • The preoccupation with “middle class” constancy strikes me as obsessive.

    The Daily Beast logo
    What Did Velma Hart Expect?

    Tunku Varadarajan

    September 21, 2010

  • The bad feelings are mainly about values, style and constancy more than policy.

    The Daily Beast logo
    Day of Reckoning

    The Daily Beast

    June 22, 2010

Historical Examples of constancy

  • 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



the quality of having a resolute mind, purpose, or affection; steadfastness
freedom from change or variation; stability
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
ecology the frequency of occurrence of a particular species in sample plots from a plant community
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.

Online Etymology Dictionary, © 2010 Douglas Harper