noun Chemistry.
the number of atoms in a molecule of a gas.

1860–65; atomic + -ity Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
atomicity (ˌætəˈmɪsɪtɪ)
1.  the state of being made up of atoms
2.  the number of atoms in the molecules of an element
3.  a less common name for valency

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Together, isolation and atomicity guarantee that millions of delicate transactions work smoothly.
It is not made of atoms, for atomicity would be a kind of property.
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