classical

From classic, from Latin classicus (of the first class).

• IPA^(key): /ˈklæsəkl/

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classical (comparative more classical, superlative most classical)

1. Of or relating to the first class or rank, especially in literature or art.
   • 1727, John Arbuthnot, Tables of Ancient Coins, Weights and Measures Explain'd and Exemplify'd in Several Dissertations, page 15:

     ... Mr. Greaves, who may be juſtly reckoned a Claſſical Author on this Subject.

2. Of or pertaining to established principles in a discipline.
   • 1992, Rudolf M[athias] Schuster, The Hepaticae and Anthocerotae of North America: East of the Hundredth Meridian, volume V, New York, N.Y.: Columbia University Press, →ISBN, page vii:

     Herbarium material does not, indeed, allow one to extrapolate safely: what you see is what you get; what you get is classical alpha-taxonomy which is, very largely and for sound reasons, in disrepute today.

3. (music) Describing European music and musicians of the late 18th and early 19th centuries.
4. (informal, music) Describing art music (rather than pop, jazz, blues, etc), especially when played using instruments of the orchestra.
5. Of or pertaining to the ancient Greeks and Romans, especially to Greek or Roman authors of the highest rank, or of the period when their best literature was produced; of or pertaining to places inhabited by the ancient Greeks and Romans, or rendered famous by their deeds.
   • 1853, Thomas Babington Macaulay, "Atterbury, Francis" in Encyclopædia Britannica (8th ed.). Dated through The Miscellaneous Writings and Speeches of Lord Macaulay, page 344

     He [Atterbury] directed the classical studies of the undergraduates of his college.

6. Conforming to the best authority in literature and art; chaste; pure; refined

   classical dance.

   • 1848, Thomas Babington Macaulay, The History of England from the Accession of James the Second, volume 1, page 151.

     Classical, provincial, and national synods.

7. (physics) Pertaining to models of physical laws that do not take quantum or relativistic effects into account; Newtonian or Maxwellian.

• classic

• classical in The Century Dictionary, New York, N.Y.: The Century Co., 1911.
• classical at OneLook Dictionary Search
• classical, classic at Google Ngram Viewer