piecewise

[pees-wahyz]
adverb Mathematics.
denoting that a function has a specified property, as smoothness or continuity, on each of a finite number of pieces into which its domain is divided: a piecewise continuous function; a piecewise differentiable curve.

Origin:
1665–75; piece + -wise

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
More complex linear control systems may use a piecewise linear approach where more than one desired control point may be required.
Thus, a piecewise-linear approximation of a function of one variable is represented in these tables.
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