Part of speech: noun

A plan or scheme subsisting in the mind only; abstract knowledge of any art; a proposed explanation: speculation.

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Usage examples "theory":

  1. It is only a theory built upon a man's character. - "From One Generation to Another", Henry Seton Merriman.
  2. They know, that, to enjoy this consolation, men must believe their religion upon some principle or other, whether of education, habit, theory, or authority. - "The Works of the Right Honourable Edmund Burke, Vol. VI. (of 12)", Edmund Burke.
  3. You, who have feeling, what is your theory when you weep?" - "Cosmopolis, Complete", Paul Bourget Last Updated: March 3, 2009.