the mind > mental capacity > belief > speculation > confirmation of hypothesis, theory > [noun] > forming of theories (4)
Without article. Abstract knowledge or principles, as opposed to practical experience or activity; theorizing, theoretical speculation.
The action of theorize, v.; an instance of this.
The belief that action should be guided primarily by theory; rigid adherence to theory. Cf. theoreticism, n. Now rare.
the action or an act of theorizing.