(n) the quality of being enduring and free from change or variation, Syn. stability, Ant. inconstancy, Example:early mariners relied on the constancy of the trade winds
(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, Syn. perceptual constancy
n. [ L. constantia: cf. F. constance. See Constant. ] 1. The state or quality of being constant or steadfast; freedom from change; stability; fixedness; immutability; as, the constancy of God in his nature and attributes. [ 1913 Webster ]
2. Fixedness or firmness of mind; persevering resolution; especially, firmness of mind under sufferings, steadiness in attachments, or perseverance in enterprise; stability; fidelity. [ 1913 Webster ]
A fellow of plain uncoined constancy. Shak. [ 1913 Webster ]
[じゅうねんいちじつ;じゅうねんいちにち, juunen'ichijitsu ; juunen'ichinichi] (n) without intermission for ten (long) years; with constancy of purpose for ten (long) years; in the same old rut for years on end