Define Domain

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All of the x values in an answer. When talking about parabolas, it is always all real numbers because the parabloa will stretch out and cover all x values.

the possible x values of a function

–noun1.a field of action, thought, influence, etc.: the domain ofscience.2.the territory governed by a single ruler or government; realm.3.a realm or range of personal knowledge, responsibility, etc.4.a region characterized by a specific feature, type of growthor wildlife, etc.: We entered the domain of the pine trees.5.Law . land to which there is superior title and absoluteownership.6.Mathematics .a.the set of values assigned to the independent variablesof a function.b.region ( def. 11a )