For a point (x,y), y is the ordinate.
So let's suppose you have a point (3,4)
The 3 will be three spaces to the right of (0,0) on the x axis.
And the y will be four spaces above that.
In this example, the ordinate is 4.
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abscissa = sqrt[1 - square of the ordinate]
it is the y-axis
The first point has a positive ordinate, the second point has a negative ordinate.
If the point's ordinate, or y-coordinate, is zero then it must lie on the x-axis somewhere.
abscissa and ordinate