well known

Adjective

well-known (comparative better-known or more well-known, superlative best-known or most well-known)

1. Familiar, famous, renowned, noted or widely known.
   • Edward Churchill still attended to his work in a hopeless mechanical manner like a sleep-walker who walks safely on a well-known round. But his Roman collar galled him, his cossack stifled him, his biretta was as uncomfortable as a merry-andrew's cap and bells.1918, W[illiam] B[abington] Maxwell, chapter XV, in The Mirror and the Lamp, Indianapolis, Ind.: The Bobbs-Merrill Company, →OCLC

   Synonyms:

   noted, twice-told

   Antonyms:

   little-known

2. (not comparable) Generally recognized; reserved for some usual purpose.
   • We would like to catalog other sockets which are supposed to be well-known1972, Vint Cerf, Jon Postel, RFC 322 - Well known socket numbers