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Meaning & Definition of Theory in English

English

Theory

/θɪri/

noun

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
  • "Theories can incorporate facts and laws and tested hypotheses"
  • "True in fact and theory"
    synonym:
  • theory

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
  • "A scientific hypothesis that survives experimental testing becomes a scientific theory"
  • "He proposed a fresh theory of alkalis that later was accepted in chemical practices"
    synonym:
  • hypothesis
  • ,
  • possibility
  • ,
  • theory

3. A belief that can guide behavior

  • "The architect has a theory that more is less"
  • "They killed him on the theory that dead men tell no tales"
    synonym:
  • theory

Examples of using

Could you elaborate on your new theory?
It's difficult to understand his theory.
The theory of the Big Bang was proposed in 1927 and expanded in 1929.