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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  

/ 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 ² 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 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

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

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

But it soon became apparent that dealing with almost constant uncertainty would be part of that life.

From BBC ● Aug. 8, 2026

It’s so intentionally inclusive and ambitious that it turns right back around to feel limiting, pigeonholing Maddie into a place where she feels in constant competition with her colleagues and herself.

From Salon ● Aug. 8, 2026

Any talk of changing the rules, salary cap or otherwise, to put reins on this kind of success would propagate underperformance and penalize this fascinating culture of constant improvement.

From Los Angeles Times ● Aug. 8, 2026

Another, says Nuttall, is that constant jawboning about deals has led to several price plunges, making traders cautious.

From The Wall Street Journal ● Aug. 7, 2026

It was a simple, reliable system, and now that they were home, Penelope realized she much preferred it to the constant flurry of postal deliveries they had endured in London.

From "The Hidden Gallery" by Maryrose Wood

His election ended a period of uncertainty following the resignation of Constant Omari Selemani in 2021 and the subsequent Fifa‑appointed Normalisation Committee established in April 2023.

From BBC ● Aug. 6, 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

Constant improvements in semiconductor technology could see other new classes of chips rise up and take their place, OneChronos CEO Kelly Littlepage said in comments shared with MarketWatch.

From MarketWatch ● May 12, 2026

Social media has created the conditions for this “doomer mindset” to flourish: Constant exposure to information, algorithm-driven echo chambers, and excessive screen time distort perception and isolate teens, making it harder to discern what’s true.

From Slate ● May 12, 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

Phone-induced distractedness, flusteredness, and agitation had been constants in life before prison.

From The Wall Street Journal ● Aug. 5, 2026

The constants not only appear compatible with a universe full of matter, but also with biological systems that depend on delicate liquid dynamics.

From Science Daily ● May 8, 2026

For decades, the mystery of fundamental constants was mostly explored through black holes, stars, and subatomic particles.

From Science Daily ● May 8, 2026

Spurs' 5-3-2 shape lacks coverage in the wide areas with the wing-backs the only constants here.

From BBC ● Mar. 12, 2026

Through most of his moves, Door had been one of the few constants in his life.

From "Boy 2.0" by Tracey Baptiste

Related Words

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