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.
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An ordinate is the "y" co-ordinate of an ordered pair. e.g. in (3,4), 4 is the ordinate. If you are interested the "x" part is called the abscissa.
Domain is a set of all abscissa in a set of points WHILE Abscissa is the x-value or the counter part of ordinate
x-coordinate: abscissa y-coordinate: ordinate
The fourth quadrant
abscissa is horizontal and ordinate is vertical one