An atomic operation.
Of or relating to atoms; composed of atoms; monatomic.
Employing or relating to nuclear energy or processes.
Infinitesimally small.
Unable to be split or made any smaller.
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.
(of a commit in a VCS) Containing a single change, as opposed to involving numerous unrelated changes.