atomist

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at·om·ism

A0503400 (ăt′ə-mĭz′əm)n. Philosophy 1. The ancient theory of Democritus, Epicurus, and Lucretius, according to which simple, minute, indivisible, and indestructible particles are the basic components of the entire universe.2. A theory according to which social institutions, values, and processes arise solely from the acts and interests of individuals, who thus constitute the only true subject of analysis.
at′om·ist n.