(chiefly in the plural) Any of the three rules for drama derived from Aristotle's Poetics: unity of action (a play should have one action that it follows, with minimal subplots), unity of time (the action should occur over a period of no more than 24 hours), and unity of place (a play should exist in a single physical space and should not attempt to compress geography, nor should the stage represent more than one place).

An extinct language of the Northwest branch of the Semitic language family.

The written Chinese language used from the Zhou Dynasty (1045 B.C.E.) (especially the Spring and Autumn Period), through to the end of the Han Dynasty (220 C.E.). In Chinese, 古文 (“Ancient Writing”) or, formally, 古典漢語 (“Classical Chinese”). The language of many classics of Chinese literature.

(physics) The study of classical relativistic equations of motion for actions involving extended nucleons interacting with massive, neutral scalar and vector meson fields.

The older language of Tagalog spoken and written in the Philippines from about 1521 C.E. to 1897 C.E., before soon developing into Modern Tagalog (Filipino) by the time of the Philippine Revolution. It developed from Old Tagalog after Christianization in the Spanish colonial period, with heavy influence from Spanish(Early Modern Spanish and Modern Spanish), Chinese(especially Hokkien), and Japanese. This was also when it first started being written in the Latin script.

Alternative form of Classical Meitei

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

Of or pertaining to classical liberalism.

(politics) A political ideology and a branch of liberalism that advocates civil liberties under the rule of law with an emphasis on economic freedom.

Someone who plays the classical guitar.