Definition of known in English:



  • past participle of know


  • 1Recognized, familiar, or within the scope of knowledge.

    ‘plants little known to western science’
    ‘the known world’
    • ‘He left no known diary, he had no known confidantes, other than his wife Mira Markovic.’
    • ‘It is not known when and if he will return and whether he will again take to the airwaves.’
    • ‘Police said he had no known reason for disappearing and appealed for more information.’
    • ‘Radiation is a known cause of the disease which genetically alters white blood cells.’
    • ‘The last known fact about her life is that she was picked up by a man from the Biltmore hotel.’
    • ‘Ricin has no known antidote, and a thousandth of a gram is enough to kill an adult.’
    • ‘He had no known connections here and his family say they do not know why or when he decided to change his name.’
    • ‘There is no known vaccine but early treatment with antibiotics has been beneficial.’
    • ‘However in those days people had only a vague concept of place outside their known world.’
    • ‘What industry would benefit from a large database of known working email addresses?’
    • ‘The seeds are crushed into a powder and there is no known antidote for the fatal solution.’
    • ‘Raids on known facilities have already been conducted and they have been destroyed.’
    • ‘The court was closed for the weekend and the amount of damage inside the building was not known.’
    • ‘The joy of recognition is rather that more becomes known than is already known.’
    • ‘There is no known mutation of the virus to a state that would allow transmission between people.’
    • ‘It isn't often that anyone else in the known universe sides with me in an argument.’
    • ‘But if justice is ever to be seen to be done then all the known facts have to be investigated.’
    • ‘This means that important calls from known people can always be identified as such.’
    • ‘Even if they come from a known source, that's no reason to suppose they are harmless.’
    familiar, known about, well known
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    1. 1.1[attributive]Publicly acknowledged to be.
      ‘a known criminal’
      • ‘Police also spoke to a known criminal in Fife who was said to be willing to kill for money.’
      • ‘I now have email filters set up to extract and delete email from known offenders.’
      • ‘The area is a known meeting point for men and police are concerned that this was a homophobic attack.’
      • ‘The rest of the known conspirators were hunted down or died while resisting arrest.’
      • ‘For some, they were too weak since they failed to resolve all of the known paradoxes.’
      • ‘Mr Burgess was a known heroin addict in the town who had a string of criminal convictions.’
      • ‘As so often with these cases, the trial of Bargh revealed he was a known sex offender.’
      recognized, well known, widely known, generally known, publicly known, noted, celebrated, notable, notorious
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    2. 1.2Mathematics (of a quantity or variable) having a value that can be stated.
      • ‘If the ratio of the two parts of a given number is known, then each of them can be found.’
      • ‘The mass of Pluto is now known accurately since a satellite Charon has been discovered.’
      • ‘There have been no major changes since last season, so we are dealing with a known quantity.’