known Definition in the Cambridge English Dictionary
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Definition of “known” - English Dictionary

Definition of "known" - American English Dictionary

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knownadjective [not gradable]

 us   /noʊn/

known adjective [not gradable] (HAVE UNDERSTANDING)

generallyunderstood 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 ​causeskinproblems.
(Definition of known from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "known" - British English Dictionary

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knownadjective

uk   /nəʊn/  us   /noʊn/
B2 used to refer to something or someone that is ​familiar to or ​understood by ​people: These ​people are known ​criminals. There is no known ​reason for the ​accident. He is known to the ​police because of his ​previouscriminalrecord.
See also
known as sth B1 If someone or something is known as a ​particularname, that ​person or thing is called by that ​name: And this is Terry, otherwise known as "Muscleman".make sth known to ​tellpeople about something so that it ​becomespublicly known: Local ​residents have made known ​theirobjections to the ​proposals. I made it known that I was not ​happy with the ​decision.
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(Definition of known from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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