con·​stant | \ ˈkän(t)-stənt How to pronounce constant (audio) \

Definition of constant

 (Entry 1 of 2)

1 : marked by firm steadfast resolution or faithfulness : exhibiting constancy of mind or attachment a constant friend
2 : invariable, uniform a constant flow should be stored at a constant temperature
3 : continually occurring or recurring : regular a constant annoyance suffers from constant headaches



Definition of constant (Entry 2 of 2)

: something invariable or unchanging: such as
a : a number that has a fixed value in a given situation or universally or that is characteristic of some substance or instrument
b : a number that is assumed not to change value in a given mathematical discussion
c : a term in logic with a fixed designation
d : something or someone that is reliably present or available My parents put in me in piano lessons when I was really young, so music has always been a constant in my life.— Mélat He's my constant for when I seek guidance both on a professional and personal front.— Gautam Mehra

Choose the Right Synonym for constant


faithful, loyal, constant, staunch, steadfast, resolute mean firm in adherence to whatever one owes allegiance. faithful implies unswerving adherence to a person or thing or to the oath or promise by which a tie was contracted. faithful to her promise loyal implies a firm resistance to any temptation to desert or betray. remained loyal to the czar constant stresses continuing firmness of emotional attachment without necessarily implying strict obedience to promises or vows. constant friends staunch suggests fortitude and resolution in adherence and imperviousness to influences that would weaken it. a staunch defender of free speech steadfast implies a steady and unwavering course in love, allegiance, or conviction. steadfast in their support resolute implies firm determination to adhere to a cause or purpose. a resolute ally

continual, continuous, constant, incessant, perpetual, perennial mean characterized by continued occurrence or recurrence. continual often implies a close prolonged succession or recurrence. continual showers the whole weekend continuous usually implies an uninterrupted flow or spatial extension. football's oldest continuous rivalry constant implies uniform or persistent occurrence or recurrence. lived in constant pain incessant implies ceaseless or uninterrupted activity. annoyed by the incessant quarreling perpetual suggests unfailing repetition or lasting duration. a land of perpetual snowfall perennial implies enduring existence often through constant renewal. a perennial source of controversy

Examples of constant in a Sentence

Adjective He suffers from constant headaches. Her constant chatter was a nuisance. The house is in constant need of repairs. The scar serves as a constant reminder of the accident. a problem demanding constant attention The equipment should be stored at a constant temperature. He kept the car's speed constant. She has struggled to maintain a constant weight. They remained constant friends throughout their lives. Noun Her job was the one constant in her life. See More
Recent Examples on the Web: Adjective More of that play will make the Huskies a Pac-12 contender as the defense has been the one constant in recent years – and this year's group looks in the same vein. Erick Smith, USA TODAY, 18 Sep. 2022 While Adeola continues to establish her eponymous brand in the luxury fashion space, one thing that has remained constant since the beginning is her loving community. Greg Emmanuel, Essence, 12 Sep. 2022 Our values have remained, and must remain, constant. Rosa Sanchez, Harper's BAZAAR, 9 Sep. 2022 Our values have remained, and must remain, constant., 9 Sep. 2022 Our values have remained, and must remain, constant. Mary Kekatos, ABC News, 9 Sep. 2022 Australian Prime Minister Anthony Albanese offered his condolences to the Royal Family and said that Queen Elizabeth was a rare and reassuring constant amid rapid change during her 70 years on the throne. WSJ, 9 Sep. 2022 Our values have remained, and must remain, constant. Emily Burack, Town & Country, 9 Sep. 2022 The total energy in a closed system is constant, even though that energy may change form. Alan Lightman, The Atlantic, 8 Sep. 2022 Recent Examples on the Web: Noun But one constant that does emerge is how much the story varied from country to country. Andrew Stuttaford, WSJ, 5 Aug. 2022 Although there were significant changes to the cast and creative team, one constant has been production designer Tony Cisek. Thomas Floyd, Washington Post, 12 July 2022 Once a constant and a comfort, the diary keeping has turned as strange as the upside-down world around him. Laura Kingstaff Writer, Los Angeles Times, 5 Aug. 2022 My presentation over those years has changed drastically in every direction, but the feeling of my ever-expansive gender hasn’t: The one constant is its ability to really surprise me. Tom Rasmussen, Vogue, 5 Aug. 2022 Far too many in cities across the state, across the nation, live with gunfire as a near constant, like cicadas on Southern summer nights. Roy S. Johnson |, al, 3 Aug. 2022 The lesson also is that a team can play poorly or go on a hot streak, attendance can ebb and come back, but food is a constant. Marc Bona, cleveland, 25 July 2022 In a 12-month stretch where nearly the entire Reds outfield changed, Naquin was the constant. Charlie Goldsmith, The Enquirer, 4 Apr. 2022 In the quixotic journey to find myself, writing was the constant. Caitlin Raux Gunther, Bon Appétit, 23 Feb. 2022 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'constant.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of constant


14th century, in the meaning defined at sense 1


1832, in the meaning defined above

History and Etymology for constant

Adjective and Noun

Middle English, from Middle French, from Latin constant-, constans, from present participle of constare to stand firm, be consistent, from com- + stare to stand — more at stand

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Time Traveler for constant

Time Traveler

The first known use of constant was in the 14th century

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Last Updated

22 Sep 2022

Cite this Entry

“Constant.” Dictionary, Merriam-Webster, Accessed 1 Oct. 2022.

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More Definitions for constant


con·​stant | \ ˈkän-stənt How to pronounce constant (audio) \

Kids Definition of constant

1 : remaining steady and unchanged a constant temperature
2 : occurring continuously or following one after another constant headaches
3 : always faithful and true constant friends

Other Words from constant

constantly adverb


con·​stant | \ ˈkän(t)-stənt How to pronounce constant (audio) \

Medical Definition of constant

 (Entry 1 of 2)

: remaining unchanged

Other Words from constant

constantly adverb



Medical Definition of constant (Entry 2 of 2)

: something invariable or unchanging especially : a number that has a fixed value in a given situation or universally or that is characteristic of some substance or instrument

More from Merriam-Webster on constant

Nglish: Translation of constant for Spanish Speakers

Britannica English: Translation of constant for Arabic Speakers Encyclopedia article about constant


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