Definition of Atomistic

Babylon English Dictionary
of atomism (atomic theory; doctrine of the action of atoms; source of mental phenomenon in simple causes)
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Atomistic Definition from Language, Idioms & Slang Dictionaries & Glossaries
Webster's Revised Unabridged Dictionary (1913)
(a.)
Of or pertaining to atoms; relating to atomism.
  
Webster's Revised Unabridged Dictionary (1913), edited by Noah Porter. About
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atomistic
\at`om*is"tic\ (&?;), a. of or pertaining to atoms; relating to atomism. [r.] it is the object of the mechanical atomistic philosophy to confound synthesis with synartesis.

WordNet 2.0

Adjective
1. divided into separate and often disparate elements
(synonym) atomistical
(antonym) holistic