well-known

UK: /ˌwɛlˈnəʊn/ US: /ˈwɛlˈnoʊn/ ,(wel′nōn′)

WordReference Random House Learner's Dictionary of American English © 2026

well-known /ˈwɛlˈnoʊn/   adj. 

1. fully or thoroughly known:
   These facts are well-known and clearly established; we will not dispute them here.
2. widely known;
   famous:
   a well-known rock star.

WordReference Random House Unabridged Dictionary of American English © 2026

well-known  (wel′nōn′), adj. 

1. clearly or fully known:
   The well-known reasons are obvious.
2. generally or widely known:
   a well-known painting.

• late Middle English 1425–75

Synonyms

• 2. . prominent, famous, noted, celebrated.

Collins Concise English Dictionary © HarperCollins Publishers::

well-known adjective (well known when postpositive)

1. widely known; famous; celebrated
2. known fully or clearly