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.

1520–30; < Latin constantia. See constant, -ancy

1. resolution, steadfastness, fidelity, fealty, loyalty, devotion. 2. permanence, regularity, dependability.

1. irresolution, infidelity. 2. fickleness. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
constancy (ˈkɒnstənsɪ)
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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1520s, from L. constantia (see constance).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Such constancy deserves particular admiration in light of the pressures brought
  about by the restaurant's increased popularity.
Staying on the job for only three years leaves little room for constancy.
Taking advantage of spectral constancy allows the user to hear speech despite
  changes to pitch.
But the ducks, tokens of the fidelity and constancy that should grace married
  life, seemed an apt and pleasant souvenir.
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