half-plane

[haf-pleyn, hahf-]
noun Mathematics.
the part of the plane on one side of a straight line of infinite length in the plane.

Origin:
1890–95

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The crack is sitting on the x-axis, which is on the boundary of the upper half-plane.
Solutions were obtained in the half-plane for varying vertical eccentricities.
The graph of the solutions of a linear inequality is a half-plane bounded by the graph of its related linear equation.
The design is independent of desired output voltage and stabilizing gain, and is free of right-half-plane zero effects.
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