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Definition of: abscissa
(ab·sis′ə) noun plural ab· scis·sas or ab·scis·sae (-ē) The distance of any point from the vertical Y-axis of ordinates in a two-dimensional system of reference, measured on a line parallel to the horizontal X-axis of abscissas. [<L (linea) abscissa (line) cut off, fem. of abscissus, pp. of abscindere.
See ABSCIND.]
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