(computing) An atomic operation.
(physics, chemistry) Of or relating to atoms; composed of atoms; monatomic.
Employing or relating to nuclear energy or processes.
Infinitesimally small.
An adjective "atomic" describes something that cannot be split or made any smaller, specifically in the context of programming commits and logical propositions.
(computing, of an operation) Guaranteed to complete either fully or not at all while waiting in a pause, and running synchronously when called by multiple asynchronous threads.