theory

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Concise Oxford English Dictionary © 2008 Oxford University Press:
theory/ˈθɪəri/
noun (pl. theories)
  • 1 a supposition or a system of ideas intended to explain something, especially one based on general principles independent of the thing to be explained.

    ■ an idea accounting for or justifying something.

  • 2 a set of principles on which an activity is based: a theory of education.

    Mathematics a collection of propositions illustrating the principles of a subject.

– phrases
in theory in an ideal or hypothetical situation.
– origin C16: via late L. from Gk theōria ‘contemplation, speculation’.
'theory' also found in these Oxford entries:

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