Definition of Theory 1. A well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena Noun 2. A tentative insight into the natural world; a concept that is not yet verified but that if true would explain certain facts or phenomena Noun 3. A belief that can guide behavior Noun Advertising & Sponsored links Synonyms for word "theory" Advertising & Sponsored links Semanticaly linked words with "theory" Hyponims for word "theory" Lexical Analysis for "theory" theoretic concerned primarily with theories or hypotheses rather than practical considerations concerned primarily with theories or hypotheses rather than practical considerations theoretician someone who theorizes (especially in science or art) someone who theorizes (especially in science or art) theorist someone who theorizes (especially in science or art) someone who theorizes (especially in science or art) someone who theorizes (especially in science or art) theorise to believe especially on uncertain or tentative grounds to believe especially on uncertain or tentative grounds theorize to believe especially on uncertain or tentative grounds to believe especially on uncertain or tentative grounds Advertising & Sponsored links Advertising & Sponsored links etymology countertheory etymology cybertheory etymology nontheory etymology theoryless etymologically related number theory etymologically related theorem etymologically related theoretical etymologically related theorise etymologically related theorize etymological origin of theoria [Latin] is derived from Theory X is derived from Theory Y is derived from acoustic theory is derived from algorithmic information theory is derived from antenna theory is derived from atomic theory is derived from catastrophe theory is derived from category theory is derived from cell theory is derived from chaos theory is derived from circuit theory is derived from complexity theory is derived from computation theory is derived from control theory is derived from critical theory is derived from decision theory is derived from domino theory is derived from extreme value theory is derived from game theory is derived from giant impact theory is derived from graph theory is derived from group theory is derived from in theory is derived from information theory is derived from kinetic theory of gases is derived from knot theory is derived from literary theory is derived from music theory is derived from number theory is derived from phlogiston theory is derived from probability theory is derived from proof theory is derived from quantum field theory is derived from rational choice theory is derived from set theory is derived from signal theory is derived from social theory is derived from systems theory is derived from theories is derived from theory of gravity is derived from theory of relativity is derived from theory of truth is derived from type theory is derived from value theory is derived from virtue theory