classical Definition

1a. Said of literature, art, etc: from ancient Greece and Rome;
1b. Said of literature, art, etc: in the style of ancient Greece and Rome.
2. Said of architecture or the other arts: showing the influence of ancient Greece and Rome.

Example: a classical façade
3. Said of music and arts related to it: having an established, traditional and somewhat formal style and form.
4. Said of procedures, etc: following the well-known traditional pattern.

Example: the classical method of making pancakes
Thesaurus: established, distinguished, standard, ranking, first-rate, superior, paramount; Antonym: transitory, popular.
5. Said of a shape, design, etc: simple; pure; without complicated decoration.
6. Said of a language: being the older literary form.
7. Said of an education: concentrating on Latin, Greek and the humanities.