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• constant
  constant

  adjective

  not changing or varying; uniform; regular; invariable.
• Constant
  Constant

  noun

  Paul Henri Benjamin Balluat Paul d'Estournelles de Constant.

constant

¹ American  

[kon-stuhnt] / ˈkɒn stənt /

adjective

1. not changing or varying; uniform; regular; invariable.

   All conditions during the three experiments were constant.

   Synonyms:

   permanent, immutable

   Antonyms:

   changeable

2. continuing without pause or letup; unceasing.

   constant noise.

   Synonyms:

   unremitting, perpetual

   Antonyms:

   fitful

3. regularly recurrent; continual; persistent.

   He found it impossible to work with constant interruption.

   Synonyms:

   ceaseless, incessant

   Antonyms:

   sporadic

4. faithful; unswerving in love, devotion, etc..

   a constant lover.

   Synonyms:

   true, staunch, loyal

   Antonyms:

   unreliable

5. steadfast; firm in mind or purpose; resolute.

   Synonyms:

   steady

6. Obsolete. certain; confident.

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noun

• constants
  plural

1. something that does not or cannot change or vary.

2. Physics. a number expressing a property, quantity, or relation that remains unchanged under specified conditions.

3. Mathematics. a quantity assumed to be unchanged throughout a given discussion.

Constant ² American  

[kawn-stahn] / kɔ̃ˈstɑ̃ /

noun

1. Paul Henri Benjamin Balluat Paul d'Estournelles de Constant.

2. Jean Joseph Benjamin 1845–1902, French painter.

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Constant ¹ British  

/ kɔ̃stɑ̃ /

noun

1. Benjamin (bɛ̃ʒamɛ̃). real name Henri Benjamin Constant de Rebecque. 1767–1830, French writer and politician: author of the psychological novel Adolphe (1816)

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constant ² British  

/ ˈkɒnstənt /

adjective

1. fixed and invariable; unchanging

2. continual or continuous; incessant

   constant interruptions

3. resolute in mind, purpose, or affection; loyal

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noun

1. something that is permanent or unchanging

2. a specific quantity that is always invariable

   the velocity of light is a constant

3. 1. maths a symbol representing an unspecified number that remains invariable throughout a particular series of operations

   2. physics a theoretical or experimental quantity or property that is considered invariable throughout a particular series of calculations or experiments

4. See logical constant

constant Scientific  

/ kŏn′stənt /

1. A quantity that is unknown but assumed to have a fixed value in a specified mathematical context.

2. A theoretical or experimental quantity, condition, or factor that does not vary in specified circumstances. Avogadro's number and Planck's constant are examples of constants.

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constant Cultural  

1. A number that appears in equations and formulas and does not vary or change. Examples are Planck's constant and the speed of light.

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Synonym Usage

See faithful.

Other Word Forms

Derived Forms

• nonconstant
  noun
• overconstantness
  noun
• overconstant
  adjective
• quasi-constant
  adjective
• unconstant
  adjective
• constantly
  adverb

Inflected Forms

Nouns

• constants
  plural

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Etymology

Origin of constant

First recorded in 1350–1400; Middle English, from Latin constant- (stem of constāns, present participle of constāre “to stand firm”), equivalent to con- con- + stā- stand + -nt- present participle suffix

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Explanation

Think of something or someone that does not change as constant. A classmate's constant drumming on the table with his fingers could be a constant source of annoyance. Constant derives from Latin verb meaning "to stand with," so something constant is continually standing with you and not wavering. You may be thankful for the constant companionship of your dog but not necessarily for your teacher's constant homework assignments. In math and science, a constant is a number that is fixed and known, unlike a variable which changes with the context. That idea crosses over to real life. If a friend is a constant in your life, that means they have always been with you and there for you.

Example Sentences

See Examples For:

constant Constant constants

This emerged as a pattern during his first term, when personnel churn was a constant.

From Salon ● Oct. 17, 2026

For 2026, Lonza reiterated its outlook of sales growth of between 11% and 12% at constant currency, and a core Ebitda margin of between 33% and 34%.

From The Wall Street Journal ● Oct. 14, 2026

In response, Saracens chief executive Ed Coetzee says the surface is kept under "constant review" and meets all maintenance and safety criteria.

From BBC ● Oct. 13, 2026

Still, both main crude contracts dropped more than one percent Tuesday, though Brent remains stuck above $100, keeping constant upward pressure on global inflation.

From Barron's ● Oct. 13, 2026

“I know it seems like a double standard, but your father needs to stay in constant contact with his business interests,” Mom added apologetically, slipping back into her chair.

From "The School for Whatnots" by Margaret Peterson Haddix

Constant stirring helps remove air bubbles, resulting in completely transparent ice, known as "junpyo" in Japanese.

From Barron's ● Sep. 6, 2026

Constant, standing on a striped rock, consists of two color patches; the rest is largely blue sea, topped by a light-gray strip of sky.

From The Wall Street Journal ● Aug. 1, 2026

Constant queues of visitors wanted to see the latest advances in the robotics field.

From BBC ● Jun. 17, 2026

Constant stretching and compression of a moon can create recurring wet dry cycles where water repeatedly evaporates and condenses.

From Science Daily ● May 29, 2026

Abenthy had given me a new piece of sympathy to practice: The Maxim of Variable Heat Transferred to Constant Motion, or something pretentious like that.

From "The Name of the Wind" by Patrick Rothfuss

Trachenko's analysis showed that some physical properties governing liquid flow could change without disrupting the combinations of constants needed to produce heavy nuclei in stars.

From Science Daily ● Oct. 11, 2026

Estimating which fundamental constants are compatible with life requires accounting for both the intrinsic properties of liquids, determined by fundamental physics, and the additional effects created by interactions among cells and molecules.

From Science Daily ● Oct. 11, 2026

Trachenko suggested that the range of constants compatible with cellular life could be surprisingly narrow.

From Science Daily ● Oct. 11, 2026

The researchers showed that there is a fundamental limit to how freely a fluid can flow, with that limit ultimately connected to the basic constants of nature.

From Science Daily ● Oct. 11, 2026

Most of the stylists are familiar, constants in the everchanging pool of tributes.

From "The Hunger Games" by Suzanne Collins

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Related Words

• ceaseless
• chronic
• continual
• continuous
• endless
• eternal
• incessant
• nonstop
• perpetual
• persistent
• relentless
• sustained
• unending
• uninterrupted
• unrelenting
• unremitting

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