Answer: abscissae

AnswerCrossword Clue
ABSCISSAESome Cartesian coordinates
ABSCISSAEMath coordinates
abscissaeABSCISSA, a measure of horizontal distance from the origin, also ABSCISS, ABSCISSE
abscissae(in a system of coordinates) The x-coordinate, the distance from a point to the vertical or y-axis measured parallel to the horizontal or x-axis