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Theories are analytical tools for understanding, explaining, and making predictions about a given subject matter. There are theories in many and varied fields of study, including the arts and sciences.

Because of the rigors of experimentation and control, it is understood to be more likely to be true than a hypothesis is. In non-scientific use, however, hypothesis and theory are often used interchangeably …

In science, an explanation or model that covers a substantial group of occurrences in nature and has been confirmed by a substantial number of experiments and observations. A theory is more general …

THEORY definition: 1. a formal statement of the rules on which a subject of study is based or of ideas that are…. Learn more.

There are nine meanings listed in OED's entry for the noun theory, two of which are labelled obsolete. See ‘Meaning & use’ for definitions, usage, and quotation evidence.

A theory is a formal idea or set of ideas that is intended to explain something. Marx produced a new theory about historical change based upon conflict.