The conceptual basis of a subject or area of study. Often opposed to practic, practice. Now archaic. Cf. theory, n. 1a.

With the. That which is theoretical; the theoretical aspects of something. Obsolete. rare.

That which is theoretical; the theoretical aspects of a subject. Often opposed to practics, practice.

The conceptual basis of a subject or area of study. Contrasted with practice.

An apparently unlikely scientific theory or assertion. Obsolete. rare.