Darwin's theory now forms the basis of all modern evolutionary thinking, of course.

This theory of tragedy, it seems, will form the basis of Eagleton's next book.

A strange theory had been forming in his mind.

Lawvere theories together with maps between them form the category Law.

Znaniecki's theories form a major part of the action theory.

His theory of virtual movement forms the basis for different movement-therapeutic concepts.

This theory formed the basis for treaties with indigenous peoples.

Dalton's atomic theory formed the groundwork of chemistry at that time.

A complete theory had now formed in Harry's mind.

An abstract image, idea, or theory, especially a complex one, formed from a number of simpler observable elements.