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physics, chemistry. any of several theories describing the structure, behavior, and other properties of the atom and its component parts.
philosophy, (def 1).
historical examples

out of the facts of chemistry the constructive imagination of dalton formed the atomic theory.
fragments of science, v. 1-2 john tyndall

the atomic theory may be advantageously resorted to, in this predicament.
a dictionary of arts, manufactures and mines andrew ure

here is the beginning of the atomic theory; and yet dalton’s strictly chemical experimental work lies in the future.
heroes of science m. m. pattison muir

this, it will be seen, was the parent of our present atomic theory.
an epitome of the history of medicine roswell park

it possesses the same merits in relation to geometry that the atomic theory has in relation to algebraic calculus.
aids to reflection samuel taylor coleridge

apart from the atomic theory there is no obvious reason why this should be so.
encyclopaedia britannica, 11th edition, volume 2, slice 8 various

we are told, for example, that the theory of gravitation is at best a hypothesis, and that such is the atomic theory.
gospel doctrine joseph f. smith

the establishment of the atomic theory now engaged most of his time and attention.
heroes of science m. m. pattison muir

we mean, of course, the atomic theory of leucippus and democritus.
a history of science, volume 1(of 5) henry smith williams

his theory of the universe was based on the atomic theory of democritus.
the new gresham encyclopedia various

noun
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
the current concept of the atom as an ent-ty with a definite structure see atomic structure