known Meaning in Cambridge American English Dictionary
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Meaning of "known" - American English Dictionary

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knownadjective [not gradable]

 us   /noʊn/

known adjective [not gradable] (HAVE UNDERSTANDING)

generally understood or proven: There is no known reason for the accident. It is a known fact that he started out a poor man. [+ to infinitive] These substances are known to cause skin problems.
(Definition of known from the Cambridge Academic Content Dictionary © Cambridge University Press)
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