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Meaning of postatomic

post•a•tom•ic

Pronunciation: (pōst"u-tom'ik), [key]
— adj.
  1. existing since or subsequent to the explosion of the first atomic bomb or the invention of atomic weapons: the political tensions of the postatomic world.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.