A specific purpose of an entity; its characteristic action.

A relationship between two sets of values, where the second value (the "output") is uniquely determined (according to some clearly specified "rule") by the first value (the "input").


A curve that encloses the major peaks of the envelope of a function.


A curve that is tangent to the peaks of the function.

See also: Constant Functions, Domain of the Function, Invertible, Linear Function, One to One, Piecewise Function, Rate of Change.

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Subjects: General