well-known

US/ˌwɛlˈnoʊn/UK/ˌwɛlˈnəʊn/

adjective

Familiar, famous, renowned, noted or widely known.

Opposite

Meanings

adjectivewell-known (comparative better-known or more well-known, superlative best-known or most well-known)

comparative better-known · comparative more well-known · superlative best-known · superlative most well-known · alternative well known · alternative wellknown

  1. Familiar, famous, renowned, noted or widely known.

    There are a number of diseases that are considered to be universally fatal. AIDS and rabies encephalitis are well-known examples.

    1997, Norris McWhirter (editor), The Guinness Book of World Records 1997, page 29
    4 more examples

    Edward Churchill still attended to his work in a hopeless mechanical manner like a sleep-walker who walks safely on a well-known round. But his Roman collar galled him, his cossack stifled him, his biretta was as uncomfortable as a merry-andrew's cap and bells.

    1918, W[illiam] B[abington] Maxwell, chapter XV, in The Mirror and the Lamp, Indianapolis, Ind.: The Bobbs-Merrill Company, →OCLC

    Furthermore, this increase in risk is comparable to the risk of death from leukemia after long-term exposure to benzene, another solvent, which has the well-known property of causing this type of cancer.

    2013 July-August, Philip J. Bushnell, “Solvents, Ethanol, Car Crashes & Tolerance”, in American Scientist

    At 6 weeks and 9 months, the babies’ motor skills were tested using the Peabody Developmental Motor Scales, a well-known assessment tool that looks at gross, fine and total motor abilities.

    2017 June 9, Susan Scutti, “Study links mosquito spray to delayed motor skills in babies”, in CNN, archived from the original on 06 Oct 2022

    Less well-known is NR's High Marnham test track, which occupies part of the former Lancashire, Derbyshire and East Coast Railway (LDECR) Chesterfield-Lincoln line in Nottinghamshire.

    2024 November 27, Ben Jones, “Testing trains, tracks and systems”, in RAIL, number 1023, page 33

    Synonyms: noted, twice-told, proverbial · Antonyms: little-known

  2. not comparablecomputingGenerally recognized; reserved for some usual purpose.

    We would like to catalog other sockets which are supposed to be well-known

    1972, Vint Cerf, Jon Postel, RFC 322 - Well known socket numbers
    2 more examples

    If the call to this function fails, you can assume the SID was invalid — even if it's a well-known SID.

    2003, John Mueller, .NET development security solutions

    A common approach is for the server to accept messages at a well-known port.

    2007, Larry L Peterson, Bruce S Davie, Computer networks: a systems approach

Synonyms & antonyms

adjectiveFamiliar, famous, renowned, noted or widely known.

Opposite

More synonyms by meaning

adjectivewidely or fully known

Similar

adjectivefrequently experienced; known closely or intimately

Similar
long-familiarfamiliar

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Middle Englishwell knowen
  2. Englishwell-known

From Middle English well knowen. By surface analysis, well + known.

Full word history & related roots →

Translations

Bulgarian известен, познат
  • известен (izvesten)familiar, widely known
  • познат (poznat)familiar, widely known
Chinese Mandarin 著名, 出名
  • 著名 (zhùmíng)familiar, widely known
  • 出名 (chūmíng)familiar, widely known
  • 有名 (yǒumíng)familiar, widely known
  • 眾所周知 /众所周知 (zhòngsuǒzhōuzhī)familiar, widely known
Czech dobře známý, pověstný
  • dobře známýfamiliar, widely known
  • pověstnýfamiliar, widely known
Danish velkendt
  • velkendtfamiliar, widely known
Esperanto konata
  • konatafamiliar, widely known
Finnish tuttu, tunnettu
  • tuttufamiliar, widely known
  • tunnettufamiliar, widely known
French bien connu
  • bien connufamiliar, widely known
German wohlbekannt, wohl bekannt
  • wohlbekanntfamiliar, widely known
  • wohl bekanntfamiliar, widely known
  • berühmtfamiliar, widely known
Hebrew מוכר
  • מוכר (mukár)familiar, widely known
Hindi प्रसिद्ध, प्रख्यात
  • प्रसिद्ध (prasiddh)familiar, widely known
  • प्रख्यात (prakhyāt)familiar, widely known
  • विख्यात (vikhyāt)familiar, widely known
  • बहुचर्चित (bahucarcit)familiar, widely known
  • लोकप्रिय (lokapriya)familiar, widely known
Hungarian híres, közismert
  • híresfamiliar, widely known
  • közismertfamiliar, widely known
Irish aithnidiúil, clúiteach
  • aithnidiúilfamiliar, widely known
  • clúiteachfamiliar, widely known
  • iomráiteachfamiliar, widely known
Italian famoso, rinomato
  • famosofamiliar, widely known
  • rinomatofamiliar, widely known
  • notofamiliar, widely known
  • celebrefamiliar, widely known
  • popolarefamiliar, widely known
Japanese 名高い
  • 名高い (nadakai)familiar, widely known
Latin perspectus, nōtus
  • perspectusfamiliar, widely known
  • nōtusfamiliar, widely known
Lithuanian gerai žinomas
  • gerai žinomasfamiliar, widely known
Norwegian Bokmål kjent, velkjent
  • kjentfamiliar, widely known
  • velkjentfamiliar, widely known
Russian знамени́тый, изве́стный
  • знамени́тый (znamenítyj)familiar, widely known
  • изве́стный (izvéstnyj)familiar, widely known
  • выдаю́щийся (vydajúščijsja)familiar, widely known
Slovak známy
  • známyfamiliar, widely known
Spanish consabido, de marras
  • consabidofamiliar, widely known
  • de marrasfamiliar, widely known
  • famosofamiliar, widely known
Swahili maalum
  • maalumfamiliar, widely known
Swedish välbekant
  • välbekantfamiliar, widely known
Cite this entry
APA

well-known. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/well-known

MLA

“well-known.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/well-known. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “well-known,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/well-known.

Source: well-known on Wiktionary, CC BY-SA 4.0.