The vertical axis of a graph is known as the ordinate and the horizontal axis of a graph is known as the abscissa. So commonly when talking about (x,y) as a point on the graph, we refer to x value as the abscissa and y value as the ordinate.
Co-ordinate is the common name. Abscissa is particularly for the information along X-axis. Oridinate is particularly for the information along Y-axis.
So abscissa is x co-ordinate and ordinate is the...