(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" すべての物質が離散的な有限分割できない破壊できない粒子で構成されるどんな理論。
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【上位】 a well-substantiated explanation of some aspect of the natural world; an organized system of accepted knowledge that applies in a variety of circumstances to explain a specific set of phenomena; "theories can incorporate facts and laws and tested hypotheses"; "true in fact and theory" 自然界のある側面の十分な裏付けがある説明。ある特定の現象を説明するための様々な状況に応用する、一般に容認された知識の組織だった体系。
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