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Synonyms

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.

noun

  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.

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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

noun

  1. something that is permanent or unchanging

  2. a specific quantity that is always invariable

    the velocity of light is a constant

    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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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)

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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.

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.

Related Words

See faithful.

Other Word Forms

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

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

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.