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atomic theory▼(theory that all gross matter is composed of atoms)noun[UK: ə.ˈtɒ.mɪk ˈθɪə.ri] [US: ə.ˈtɑː.mɪk ˈθɪ.ri]
atomism▼(ancient Greek theory)noun[UK: ˈæ.tə.ˌmɪ.zəm] [US: ˈæ.tə.ˌmɪ.zəm]
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