Relating to or using the energy produced by splitting atoms or the process of nuclear fission. The atomic bomb caused unprecedented destruction during the war.
Relating to an atom or atoms. The atomic structure of the element determines its chemical properties.
Extremely small or minute. The scientist used an atomic scale to measure the tiny particles.
Computing: Guaranteed to occur completely or not at all; indivisible and uninterruptible as a single operation. The counter update must be atomic to avoid race conditions.