In chemistry, atomicity is the total number of atoms present in 1 molecule of a substance
In computing:
Atomicity (database systems), a property of database transactions which are guaranteed to either completely occur, or have no effects.
Atomicity (programming), in computer science, especially parallel algorithms, an operation appears to occur at a single instant between its invocation and its response.
Atomicity, a property of an S-expression, in a symbolic language like Lisp, to describe whether an expression is made of atoms (numbers or symbols) or is a list of S-expressions
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