Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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atomic theory any of several theories concerning the structure, properties, or behavior of atoms. [2 definitions]
big bang theory the theory that the universe originated at a fixed point billions of years ago in a cosmic explosion of a mass of hydrogen atoms, and that it has been expanding ever since. (Cf. steady state theory.)
Darwinian theory Charles Darwin's theory that plants and animals evolved from early primitive life forms with variation caused by natural selection and survival of the fittest. (See evolution.)
domino theory a theory that if one event occurs, such as the fall of one country under Communist control, a chain of related events will be triggered thereby, such as the fall of neighboring countries.
field theory in physics, a mathematical description of the effects of physical fields on the distribution and behavior of matter.
game theory mathematical analysis of strategies for maximizing gains and minimizing losses, applied to games of strategic competition and to corporate, military, and other decision-making problems.
kinetic theory in physics, the theory that the particles of all matter are in constant motion and that temperature is dependent on the speed of such motion.
quantum theory a theory in physics that energy radiates or is absorbed in discontinuous quantities, each a multiple of indivisible units or quanta.
set theory the study of the mathematical properties of, and relations between, sets.
steady state theory the cosmologic theory, no longer in favor, that new matter is continuously created, causing the universe to expand without requiring cycles of explosion and contraction. (Cf. big bang theory.)
theory of games see game theory.