Science Dictionary
abscissa   (āb-sĭs'ə)  Pronunciation Key 

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Plural abscissas or abscissae (āb-sĭs'ē)
The distance of a point from the y-axis on a graph in the Cartesian coordinate system. It is measured parallel to the x-axis. For example, a point having coordinates (2,3) has 2 as its abscissa. Compare ordinate.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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