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Definition of theorize : To form a theory or theories; to form opinions solely by theory; to speculate.

Synonyms:

muse, mull, thoughts, think over, say, excogitate, presuppose, chew over, mull over, ponder, hypothesise, ruminate, reckon, job, theorise, belief, hypothecate, meditate

design, imagine, conceive, perceive, plan, invent, daydream, ideate, suppose, consider, envision, observe, reflect, create, opine, think, contemplate, brainstorm, fantasize

hypothesize, philosophize, guess, conjecture, presume, speculate, prophesy

Usage examples:

• Unembroidered facts were what they required in the first instance, but later he might be permitted to theorize. - "Prescott of Saskatchewan", Harold Bindloss.
• In contrast, there are others who read and theorize too exclusively, and are inclined to assert that concentrated fertilizers supersede all others. - "Success With Small Fruits", E. P. Roe.
• " I never theorize," she reminded me. - "The Million-Dollar Suitcase", Alice MacGowan Perry Newberry.