Theoretical knowledge; theory. Often opposed to practic, practice. Cf. theoretical, adj. Now rare.

An explanation of a phenomenon arrived at through examination and contemplation of the relevant facts; a statement of one or more laws or…

Theory, hypothesis; theory (as opposed to practice). colloquial. Obsolete.

A hypothetical construction, a theory. Obsolete.

In plural. Frequently with the. That which is theoretical; the theoretical aspects of a topic, discipline, etc.