(physics) All of the physical laws of nature that account for the behaviour of the normal world, but break down when dealing with the very small (see quantum mechanics) or the very fast or very heavy (see relativity).

The Latin language as spoken and written in formal speeches, literature, the arts, etc., by the ancient Romans.

(music) Music of the classical period; the music of Mozart, Haydn, etc; the musical period before the romantic.

(physics) all aspects of physics developed before the rise of quantum mechanics

The variants of the Nahuatl language spoken in central Mexico at the time of the Spanish conquest.

A codified form of Sanskrit spoken in ancient India.

The Japanese language as spoken and written which was used during about 900-1200 C.E. and continued to be commonly used as the written language until about 1900 C.E..

(computing) A computer which is not a quantum computer, nor enjoys any other sort of (yet unknown) mechanism for transcending known computer science; a computer which can be modelled by a deterministic Turing machine

plural of classical computer

(literature, linguistics) An ancient language that has an independent tradition that arose mostly on its own, and has a large and rich body of ancient literature.