
1) Particle theory 2) Scientific theory 3) sociological theory 4) Theory on makeup of universe
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Atomism (from Greek ἄτομον, atomon, i.e. `uncuttable`, `indivisible`) is a natural philosophy that developed in several ancient traditions. The atomists theorized that nature consists of two fundamental principles: atom and void. Unlike their modern scientific namesake in atomic theory, philosophical atoms come in an infinite variety of...
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http://en.wikipedia.org/wiki/Atomism
[social] Atomism or social atomism is a sociological theory arising from the scientific notion atomic theory, coined by the ancient Greek philosopher Democritus and the Roman philosopher Lucretius. In the scientific rendering of the word, atomism refers to the notion that all matter in the universe is composed of basic indivisible component...
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http://en.wikipedia.org/wiki/Atomism_(social)

belief that the universe consists of small indivisible particles
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• (n.) The doctrine of atoms. See Atomic philosophy, under Atomic.
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any doctrine that explains complex phenomena in terms of aggregates of fixed particles or units. This philosophy has found its most successful ... [29 related articles]
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http://www.britannica.com/eb/a-z/a/120

The theory that all matter consists of atoms – minute indestructible particles, homogeneous in substance but varied in shape. It was also the earliest cosmological worldview to espouse pluralism and the existence of extraterrestrial life. Developed in Greece in the fourth and fifth centuries...
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At'om·ism noun [ Confer French
atomisme .] The doctrine of atoms. See
Atomic philosophy , under
Atomic .
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http://www.encyclo.co.uk/webster/A/140

Type: Term Pronunciation: at′ŏm-izm Definitions: 1. The approach to the study of a psychological phenomenon through analysis of the elementary parts of which it is assumed to be composed.
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the theory, as set forth by philosophers such as Democritus, that physical objects consist of minute, indivisible particles moving in a void.
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http://www.philosophicalsociety.com/glossary.htm

the theory that all the objects in the universe are composed of very small, indestructible elements. (This is the case for the Western [i.e., Greek] theories of atomism. Buddhists also have well-developed theories of atomism, and which involve momentary, or non-eternal, atoms, that flash in and out of existence).
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theory originated by Leucippus, developed by Democritus and adopted by Epicurus as a basis of his moral philosophy according to which the universe is made up of invisible and indestructible elements called atoms.
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atomic theory noun (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles; `the ancient Greek philosophers Democritus and Epicurus held atomic theories of the universe`
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As contrasted with synechism, the view that there are discrete irreducible elements of finite spatial or temporal span. E.g., the atomic doctrine of Democritus that the real world consists of qualitatively similar atoms of diverse shapes. Lucretius, De Natura Rerurn. See Epicurus. Cf. K. Lasswitz, Gesch. d. Atomismus. As contrasted with the view .....
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Also calledthe theory that minute, discrete, finite, and indivisible elements are the ultimate constituents of all matter. · a method or theory that reduces all psychological phenomena to simple elements.
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https://www.infoplease.com/dictionary/atomism

(psychology) a theory that reduces all mental phenomena to simple elements (sensations and feelings) that form complex ideas by
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