• synonyms


[thee-uh-rahyz, theer-ahyz]
verb (used without object), the·o·rized, the·o·riz·ing.
  1. to form a theory or theories.
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verb (used with object), the·o·rized, the·o·riz·ing.
  1. to form a theory or theories about.
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Also especially British, the·o·rise.

Origin of theorize

From the Medieval Latin word theōrizāre, dating back to 1630–40. See theory, -ize
Related formsthe·o·ri·za·tion, nounthe·o·riz·er, nouno·ver·the·o·ri·za·tion, nouno·ver·the·o·rize, verb (used without object), o·ver·the·o·rized, o·ver·the·o·riz·ing.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for theorised

Historical Examples of theorised

  • It theorised not, indeed, about the Incarnation and the modes of the Divine existence.

    The Expositor's Bible: The Acts of the Apostles, Vol. 2

    G. T. Stokes

  • The campaign would probably be conducted as theorised by Don Rafael.

  • Why should not Othello marry Desdemona, and keep her at her father's, as theorised?

  • That was the conclusion which he arrived at when he theorised on matter without any theological aim.


    Robert Flint

  • Claes had been suddenly jerked from the ideal world in which he theorised and toiled into the real world of men.

British Dictionary definitions for theorised



  1. (intr) to produce or use theories; speculate
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Derived Formstheorization or theorisation, nountheorizer or theoriser, noun
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for theorised



1630s, perhaps a formation in English from theory + -ize. Related: Theorized; theorizing.

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Online Etymology Dictionary, © 2010 Douglas Harper