of, pertaining to, resulting from, or using atoms, atomic energy, or atomic bombs: an atomic explosion.
propelled or driven by atomic energy: an atomic submarine.
Chemistry. existing as free, uncombined atoms.
extremely minute.

Nearby words

  1. atom,
  2. atom bomb,
  3. atom smasher,
  4. atom trap,
  5. atom-bomb,
  6. atomic age,
  7. atomic bomb,
  8. atomic clock,
  9. atomic cocktail,
  10. atomic energy

Also a·tom·i·cal.

Origin of atomic

First recorded in 1670–80; atom + -ic

Related formsa·tom·i·cal·ly, adverbnon·a·tom·ic, adjectivenon·a·tom·i·cal, adjectivenon·a·tom·i·cal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for atomic

British Dictionary definitions for atomic



of, using, or characterized by atomic bombs or atomic energyatomic warfare
of, related to, or comprising atomsatomic hydrogen
extremely small; minute
logic (of a sentence, formula, etc) having no internal structure at the appropriate level of analysis. In predicate calculus, Fa is an atomic sentence and Fx an atomic predicate
Derived Formsatomically, adverb

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

Word Origin and History for atomic


Online Etymology Dictionary, © 2010 Douglas Harper

Science definitions for atomic



Relating to an atom or to atoms.
Employing nuclear energy.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.