DictionarytheoryEvidence-based explanation
noun

theory

THEE-uh-ree/ˈθiːəri/

An organized explanation of how something works.

The scientist develops a theory to explain how light affects plant growth.

Scientist considers evidence from two plants, one healthy in light and one pale under removed opaque cover, beside simple drawing sun arrow to growing plant in thought bubble; explanation of light affecting growth supported by comparison, no text or complex lab.
Etymology

Greek theōria connected looking at something with contemplating it. The mental sense developed into a scheme of ideas and then an explanation based on observation and reasoning.

In context

Revolutionary Communist Party19:59
theory is the is the concentrated experience of the class struggle that's what they were doing writing down the generalized lessons of these events that could be applied by the revolutionary movement
The revolutionary ideas of Friedrich Engels

More examples

  • Germ theory explains how microorganisms cause many diseases.
  • New evidence supports the theory of evolution.
  • Researchers compare two theories that explain how planets form.

Forms

theory · theories

theorist noun — A person who develops or studies theories.

Similar words

explanation
Broader term; need not organize evidence into general principles.
model
A simplified representation used to explain or predict behavior.
hypothesis
A proposed explanation to test, rather than an established framework.