constancy

It conveys the constancy and consistency of the alliance, a special relationship.
Rick Perry's Dangerous Israel Gaffe|Bruce Riedel|November 13, 2011|DAILY BEAST
She left her son with one place to go: in search of a constancy, a definition he had never known.
Dreams of His Mother|Stacy Schiff|May 3, 2011|DAILY BEAST
The preoccupation with “middle class” constancy strikes me as obsessive.
What Did Velma Hart Expect?|Tunku Varadarajan|September 21, 2010|DAILY BEAST
The bad feelings are mainly about values, style and constancy more than policy.
Day of Reckoning|The Daily Beast|June 22, 2010|DAILY BEAST

George had forgotten her, and she had wept sorely over his want of constancy.
The Golden Lion of Granpere|Anthony Trollope
His constancy to his theories, whether of faith or art, was English; his roughness of form was positively early Teutonic.
The Poetry Of Robert Browning|Stopford A. Brooke
Nanna, Balder's wife, is the ensample of constancy; her name is maiden.
The Classic Myths in English Literature and in Art (2nd ed.) (1911)|Charles Mills Gayley
It is literally the "Constancy" of the thing;—you shall win it—move it—come at it—for no less than this.
Unto This Last and Other Essays on Political Economy|John Ruskin
It says much for our Anglo-Saxon wives that their constancy has passed into many proverbs.
Brave Men and Women|O.E. Fuller

British Dictionary definitions for constancy

constancy

/ (ˈkɒnstənsɪ) /

noun

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