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.
Also, atomical.

1670–80; atom + -ic

atomically, adverb
nonatomic, adjective
nonatomical, adjective
nonatomically, adverb Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
atomic (əˈtɒmɪk)
1.  of, using, or characterized by atomic bombs or atomic energy: atomic warfare
2.  of, related to, or comprising atoms: atomic hydrogen
3.  extremely small; minute
4.  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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1670s as a philosophical term (see atomistic); scientific sense dates from 1811, from atom. Atomic number is from 1821; atomic mass is from 1898. Atomic energy first recorded 1906; atomic bomb first recorded 1914 in writings of H.G. Wells, who
thought of it as a bomb "that would continue to explode indefinitely."
"When you can drop just one atomic bomb and wipe out Paris or Berlin, war will have become monstrous and impossible." [S. Strunsky, "Yale Review," January 1917]
Atomic Age is from 1945.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
atomic   (ə-tŏm'ĭk)  Pronunciation Key 
  1. Relating to an atom or to atoms.

  2. Employing nuclear energy.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Computing Dictionary

atomic definition

(From Greek "atomos", indivisible) Indivisible; cannot be split up.
For example, an instruction may be said to do several things "atomically", i.e. all the things are done immediately, and there is no chance of the instruction being half-completed or of another being interspersed. Used especially to convey that an operation cannot be interrupted.
An atomic data type has no internal structure visible to the program. It can be represented by a flat domain (all elements are equally defined). Machine integers and Booleans are two examples.
An atomic database transaction is one which is guaranteed to complete successfully or not at all. If an error prevents a partially-performed transaction from proceeding to completion, it must be "backed out" to prevent the database being left in an inconsistent state.
[Jargon File]
The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
They were stridently anti-nuclear: the monster emerged after an atomic
There are extreme measures occurring all over the globe to silence the outcry
  against nuclear and its atomic lies.
The wisdom of experience was useless in the atomic era, because no one had ever
  participated in a nuclear exchange.
Much of his early work centered on atomic energy, and he opposed both nuclear
  and coal-fired plants.
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