Definition from Wiktionary, the free dictionary
- From Latin abscissa, feminine of abscissus, perfect passive participle of abscindō (“cut off”).
- See abscind.
- (geometry) The first of the two terms by which a point is referred to, in a system of fixed rectilinear coordinate (Cartesian coordinate) axes. The abscissa is also known as the "x" coordinate of a point, shown on the horizontal line, with the ordinate, also known as the "y" coordinate, shown on the vertical line. [First attested in the late 17th century.]
- The point has 3 as its abscissa and 2 as its ordinate.
Usage notes 
See also 
first of two coordinates
- 2003 , Brown, Lesley editor, The Shorter Oxford English Dictionary, edition 5th, Oxford, UK: Oxford University Press, ISBN 978-0-19-860575-7, page 8:
- nominative feminine singular of abscissus
- nominative neuter plural of abscissus
- accusative neuter plural of abscissus
- vocative feminine singular of abscissus
- vocative neuter plural of abscissus
- ablative feminine singular of abscissus