Atomic philosophy

a system which, assuming that atoms are endued with gravity and motion, accounted thus for the origin and formation of all things. This philosophy was first broached by Leucippus, was developed by Democritus, and afterward improved by Epicurus, and hence is sometimes denominated the Epicurean philosophy.

See also: Atomic

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Changes in atomic physics, says Heisenberg, "have made us abandon the world-view of ancient atomic philosophy. It has become clear that the desired objective reality of the elementary particles is too crude an oversimplification of what really happens, and that it must give way to very much more abstract conceptions."