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operator op·er·a·tor (ŏp'ə-rā'tər)
An operator gene.
in mathematics, any symbol that indicates an operation to be performed. Examples are x (which indicates the square root is to be taken) and ddx (which indicates differentiation with respect to x is to be performed). An operator may be regarded as a function, transformation, or map, in the sense that it associates or "maps" elements from one set to elements from another set. See also automorphism.