constancy

Academic Word List, sublist 3.

About 2.18 uses per million words.

Meaning

1. noun The quality of being constant; steadiness or faithfulness in action, affections, purpose, etc.
2. noun An unchanging quality or characteristic of a person or thing.

Similar words

stability continuity persistence steadfastness perseverance regularity predictability uniformity lightness coherence

Often followed by

of and in is to with or which that

Word family

constancies constant constantly constants