WordReference Random House Unabridged Dictionary of American English © 2025
at•om•ism
(at′ə miz′əm),USA pronunciation n.
at ′om•ist, n.
at′om•is ′tic, at′om•is′ti•cal, adj.
at′om•is ′ti•cal•ly, adv.
- PhilosophyAlso called atomic theory. the theory that minute, discrete, finite, and indivisible elements are the ultimate constituents of all matter.
- [Psychol.]a method or theory that reduces all psychological phenomena to simple elements.
- 1670–80
at′om•is ′tic, at′om•is′ti•cal, adj.
at′om•is ′ti•cal•ly, adv.
'atomism' also found in these entries (note: many are not synonyms or translations):