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Definition from macmillandictionary.com

atom

 
 
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noun [countable] American English pronunciation: atom /ˈætəm/ 
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singularatom
pluralatoms

Related thesaurus entries

  1. 2
    [usually in negatives] a very small amount of something

    He hasn't an atom of sense.

This is the American English definition of atom. View British English definition of atom.