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Webster 1913 Edition

Noun.

[Cf. F.

atomisme

The doctrine of atoms. See

Atomic philosophy

, under

Noun.

The doctrine of atoms.

atomism ‎(countable and uncountable, plural atomisms)

(philosophy) The ancient Greek theory that all matter is composed of very small indestructible and indivisible particles.
(philosophy) The doctrine that society arises from individuals and that larger structures are unimportant.

ancient Greek theory