Adjective atomic has 3 senses
  1. atomic - of or relating to or comprising atoms; "atomic structure"; "atomic hydrogen"
  2. nuclear, atomic - (weapons) deriving destructive energy from the release of atomic energy; "nuclear war"; "nuclear weapons"; "atomic bombs"
  3. atomic, atomlike, minute - immeasurably small
    Antonyms: macroscopic, macroscopical, large (indirect, via microscopic)
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