Synonyms for Theory:

n.

faith, data, argument, ideal, plea, outlook, basis, rationale, approach, code, Systemization, method, provision, conditions, philosophy, commitment, dogma, principles, law, foundation, doctrine. explanation, instruction, gloss, assumption, interpretation, outline, clarification. frame of reference, ideology, ground, belief, ism, the spirit of the times/age, culture. premise, postulate, reason, thesis, presupposition, postulation. belief (noun)
dogma, opinion, notion.
beliefs (noun)
ideology.
hypothesis, belief (noun)
guess, Systemization, thesis, conjecture, dogma, code, foundation, doctrine, concept, approach, outlook, rationale, method, argument, speculation, idea, supposition, provision, conditions, basis, premise, postulate, philosophy, ideology, presumption, plan, assumption.
idea (noun)
brainstorm, observation, plan, conception, inspiration, consideration, thought, ideation, design, supposition, vision, opinion, reflection, notion, perception, inkling, principle, idea, concept, image.
supposition (noun)
hypothesis, speculation, fantasy, presumption, imagination, prophecy, guess, conjecture.
theory (noun)
possibility, hypothesis.
thought (noun)
thought.

Other synonyms:

assumption, premise, faith. culture, argument. thesis, outline. gloss. law. ground. Other relevant words:
commitment, conditions, explanation, ideology, assumption, argument, rationale, interpretation, code, approach, premise, postulation, ideal, culture, foundation, postulate, basis, doctrine, law, ism, thesis, method, provision, possibility, philosophy, Systemization, outlook, presupposition, gloss, dogma, belief, reason, data.

Usage examples for theory

  1. He had a theory that little men had little souls. – Gunman's Reckoning by Max Brand
  2. " Now, I'm going to give you my theory he said. – The Just and the Unjust by Vaughan Kester
  3. All this was very well in theory – The Road to Understanding by Eleanor H. Porter