Source : Webster's Revised Unabridged Dictionary (1913)

Well-known \Well"-known`\, a.
   Fully known; generally known or acknowledged.

         A church well known with a well-known rite. --M.
                                                  Arnold.

Source : WordNet®

well-known
     adj 1: widely or fully known; "a well-known politician";
            "well-known facts"; "a politician who is well known";
            "these facts are well known"
     2: frequently experienced; known closely or intimately; "a
        long-familiar face"; "a well-known voice reached her ears"
        [syn: {long-familiar}, {well-known(a)}]