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atomic

1. of, using, or characterized by atomic bombs or atomic energy
2. of, related to, or comprising atoms
3. Logic (of a sentence, formula, etc.) having no internal structure at the appropriate level of analysis. In predicate calculus, Fa is an atomic sentence and Fx an atomic predicate
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

atomic

(jargon)
(From Greek "atomos", indivisible) Indivisible; cannot be split up.

For example, an instruction may be said to do several things "atomically", i.e. all the things are done immediately, and there is no chance of the instruction being half-completed or of another being interspersed. Used especially to convey that an operation cannot be interrupted.

An atomic data type has no internal structure visible to the program. It can be represented by a flat domain (all elements are equally defined). Machine integers and Booleans are two examples.

An atomic database transaction is one which is guaranteed to complete successfully or not at all. If an error prevents a partially-performed transaction from proceeding to completion, it must be "backed out" to prevent the database being left in an inconsistent state.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

atomic

Indivisible. An atomic operation, or atomicity, implies an operation that must be performed entirely or not at all. For example, if machine failure prevents a transaction to be processed to completion, the system will be rolled back to the start of the transaction. See two-phase commit and atom.
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References in periodicals archive ?
Atomically thin materials are a relatively recent discovery.
Bhaskaran et al., "Atomically thin layers of Mo[S.sub.2] via a two step thermal evaporation-exfoliation method," Nanoscale, vol 4, no.
Zettl, "Atomically thin hexagonal boron nitride probed by ultrahigh-resolution transmission electron microscopy," Physical Review B--Condensed Matter and Materials Physics, vol.
Caption: FIGURE 4: (a) Atomically resolved graphite image taken in air and at room temperature under constant current mode with a sample-positive bias voltage of 300 mV, a setpoint of 0.8 A, and a scan area 10 [Angstrom] x 10 [Angstrom].
Caption: FIGURE 7: The specific plate model atomically constructed based on the parameter maps and femur parameters.
Synthesis: Atomically precise nanoparticles synthesis involves three steps.
He pointed out that not much research has been done in the area of atomically controlled cluster catalysis, with the exception of studies on carbon monoxide oxidation reaction.
"The nanomaterial would absorb hydrogen atomically through heat and be able to release the atoms and recombine them to a hydrogen gas,"[euro]oCi said Dr Boudina.
This is the first time anyone has shown the piezoelectric effect in atomically thin films, although the property has been predicted.
"We've developed the first membrane that consists of a high density of sub-nanometre-scale pores in an atomically thin, single sheet of graphene," said graduate student Sean O'Hern of MIT, who is working on the research along with Rohit Karnik, associate professor of mechanical engineering.
atomically word CAS (word *addr, word old_value, word new.value) { word old:= *addr; if (old = old_value) * addr:= new_value; return old; } The rest of this paper is organized as follows.