ab·scis·sa
(
ab-s
is
ə)
n.pl. ab·scis·sas or
ab·scis·sae(-s
is
e)
Symbol xThe coordinate representing the position of a point along a line perpendicular to the y-axis in a plane Cartesian coordinate system.
[New Latin(linea) abscissa, (line) cut off, fromLatinabscissa, feminine past participle ofabscindere, to abscise; see ABSCISSION.]

abscissaThe coordinates for A are (4,3); the abscissa is 4 and the ordinate is 3.