adj

constant

KONS-tuhnt

adj

Not changing; staying the same over time.

"The engine ran at a constant speed for the whole test."

"She lived with constant pain for years before the diagnosis."

Loyal and dependable; steady in feeling or purpose.

"He remained constant to his friends even when it cost him."

noun

A value or quantity that never changes.

"The speed of light is treated as a constant in physics."

"In the formula, k is a constant, not a variable."

How to Use Constant

Learner’s notes

In plain EnglishSomething (or someone) that doesn't change.

Common pairings

a constant reminder remain constant hold something constant

more constant comparative, constants plural, most constant superlative

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The engine ran at a _____ speed for the whole test.

From Old French constant, from Latin constans, "standing firm," from constare, "to stand together, be consistent."

unaltering unvarying

stable steady

unaltering unvarying stable steady