Constancy

[kon-stuh n-see] /ˈkɒn stən si/

noun
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.
/ˈkɒnstənsɪ/
noun
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
n.

1520s, from constance + -cy.

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