What does theory mean?

Looking for the meaning or definition of the word theory? Here's what it means.

Noun (obsolete) Mental conception; reflection, consideration. [16th-18th c.] (sciences) A coherent statement or set of ideas that explains observed facts or phenomena, or which sets out the laws and principles of something known or observed; a hypothesis confirmed by observation, experiment etc. [from 17th c.] (uncountable) The underlying principles or methods of a given technical skill, art etc., as opposed to its practice. [from 17th c.] (mathematics) A field of study attempting to exhaustively describe a particular class of constructs. [from 18th c.] A hypothesis or conjecture. [from 18th c.] (logic) A set of axioms together with all statements derivable from them. Equivalently, a formal language plus a set of axioms (from which can then be derived theorems). Find more words! 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