Etymology
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constancy (n.)

1520s, "fixedness or firmness of mind," a fuller form of constance (q.v.) with abstract noun suffix -cy. Meaning "faithfulness, fidelity" (to a person or cause) is from 1540s; that of quality of immutability, a permanent state" is from c. 1600.

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Definitions of constancy

constancy (n.)
the quality of being enduring and free from change or variation;
early mariners relied on the constancy of the trade winds
Synonyms: stability
constancy (n.)
(psychology) the tendency for perceived objects to give rise to very similar perceptual experiences in spite of wide variations in the conditions of observation;
Synonyms: perceptual constancy
constancy (n.)
faithfulness and dependability in personal attachments (especially sexual fidelity);
From wordnet.princeton.edu