atomic theory

noun

1. Physics, Chemistry. any of several theories describing the structure, behavior, and other properties of the atom and its component parts.
2. Philosophy. atomism ( def 1 ).

atomic theory

noun

1. any theory in which matter is regarded as consisting of atoms, esp that proposed by John Dalton postulating that elements are composed of atoms that can combine in definite proportions to form compounds
2. See atomic structure
   the current concept of the atom as an entity with a definite structure See atomic structure

Word History and Origins

Origin of atomic theory¹

First recorded in 1840–50

Example Sentences

The Karaites before Maimonides adopted the atomic theory without question.

From Project Gutenberg

The Mutakallimun were opposed to the Aristotelian theory of matter and form, and substituted for it the atomic theory.

From Project Gutenberg

But he shows himself a more loyal follower of the Kalam by frankly adopting the atomic theory, whereas Saadia opposes it (p. 25).

From Project Gutenberg

Maimonides's criticism of the atomic theory of matter and motion just described is that it undermines the bases of geometry.

From Project Gutenberg

This is the proof of the atomic theory and it has nothing to do with the matter of the origin of the world.

From Project Gutenberg