constancy

noun

con·​stan·​cy ˈkän(t)-stən(t)-sē 

plural constancies

1

a

: steadfastness of mind under duress : fortitude

b

: fidelity, loyalty

2

: a state of being constant or unchanging

Synonyms of constancy

• stability
• consistency

Examples of constancy in a Sentence

the constancy of the Earth's rotation

the mistaken notion that there is constancy in language—words do indeed change their meanings over time

Recent Examples on the Web

The relative constancy of fat cell numbers combined with their ability to change size and function has implications for the evolutionarily unusual state of being obese. — Literary Hub, 17 Aug. 2026

This transition represents a strong, continuing trajectory of comfort, longevity, and constancy. — Michele Laufik, Martha Stewart, 5 Aug. 2026

Reid’s constancy is one of the gifts that has led him to the pinnacle of the NFL as the fourth-winningest coach in league history. — Vahe Gregorian july 31, Kansas City Star, 31 July 2026

Remarkable for her constancy and intelligence, Penelope devises delay tactics to discourage 108 aggressive suitors during Odysseus’s 20-year absence. — Encyclopedia Britannica, 1 July 2026

Word History

First Known Use

1523, in the meaning defined at sense 1a

Rhymes for constancy

• inconstancy

Kids Definition

constancy

noun

con·​stan·​cy ˈkän(t)-stən-sē 

plural constancies

1

: firmness and loyalty in one's beliefs or personal relationships

2

: freedom from change