What is the meaning of classic?

noun

• A creation of the highest excellence.
• An artist who has created classic works.

adjective

• Of recognized authority or excellence.
  • usage: "the definitive work on Greece"; "classical methods of navigation"
  • synonyms: authoritative, classical, definitive
• Of or relating to the most highly developed stage of an earlier civilisation and its culture.
  • usage: "classic Cinese pottery"
  • synonyms: classical
• Of or pertaining to or characteristic of the ancient Greek and Roman cultures."classical mythology"; "classical
  • synonyms: classical, Greco-Roman, Graeco-Roman, Hellenic