A set of assumptions, propositions, or accepted facts that attempts to provide a plausible or rational explanation of cause-and-effect (causal) relationships among a group of observed phenomenon. The word's origin (from the Greek thorós, a spectator), stresses the fact that all theories are mental models of the perceived reality.

Use theory in a sentence

  • One theory for the recent decline of our stock price is that the price of steel is expected to decline significantly next month, but if you ask me, it is more likely due to an overall reduction in consumer optimism.

    10 people found this helpful
  • I heard a theory that beauty marks on your skin are actually wounds from your past lives, that each mark stands for the part of your body where you were injured, ill, or killed in a previous life.

    10 people found this helpful
  • There is a quantum theory by Schrodinger that demonstrates how things can operate differently when we observe it and when they are not visible.

    10 people found this helpful
Show more usage examples...

Related Videos

Have a question about theory? Ask for help in the
Browse by Letter: # A B C D E F G H I J K L M N O P Q R S T U V W X Y Z