Etymology
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well-known (adj.)

late 15c., from well (adv.) + past participle of know (v.).

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Definitions of well-known

well-known (adj.)
frequently experienced; known closely or intimately;
a well-known voice reached her ears
Synonyms: long-familiar
well-known (adj.)
widely or fully known;
a well-known politician
well-known facts
From wordnet.princeton.edu