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2017 Word of the Year

atomic theory

noun
1.
Physics, Chemistry. any of several theories describing the structure, behavior, and other properties of the atom and its component parts.
2.
Philosophy. atomism (def 1).
Origin of atomic theory
1840-1850
First recorded in 1840-50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for atomic theory

atomic theory

noun
1.
any theory in which matter is regarded as consisting of atoms, esp that proposed by John Dalton postulating that elements are composed of atoms that can combine in definite proportions to form compounds
2.
the current concept of the atom as an entity with a definite structure See atomic structure
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Value for atomic

10
12
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