ideal point

noun Mathematics.
the point at infinity in projective geometry at which parallel lines intersect.

1875–80 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The differential input to the scope provides an ideal point to balance the dark current output of the phototube.
Because of the high degree of beam collimation, a laser serves as an almost ideal point source of intense light.
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