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

• changelessness
• fixedness
• immutability
• immutableness
• invariability
• stability
• steadiness
• unchangeableness

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

In the 1940s scientists realized this cosmic constancy could be used to measure time without the chaotic noise associated with other physical clocks. —Allison Parshall, Scientific American, 11 Sep. 2024

Our second table has a higher hurdle for constancy of growth: All these land in the top decile of the universe in predictability of the earnings progression. —William Baldwin, Forbes, 3 Sep. 2024

With this new distance dependence from quantum loops lodged within the coupling constant, these quantities lost their constancy. —Stanley J. Brodsky, Scientific American, 16 Apr. 2024

To a stunning degree, the Trump administration has diminished the sense of U.S. constancy that has been indispensable to the postwar liberal order. —Eliot A. Cohen, Foreign Affairs, 11 Dec. 2018

Word History

First Known Use

15th century, in the meaning defined at sense 1a

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