"Abscissa" is another name for "x-coordinate"
"Ordinate" is another name for "y-coordinate".

Look at this graph of the point (3,2)



The 3 is called the abscissa, and the 2 is called the ordinate.

In this picture the red line, which is 3 units long,
 is the abscissa and the green line, which is 2 units
long, is the ordinate:




Together the abscissa, 3, and the ordinate, 2, make up 
the two coordinates of the point (3,2)

Edwin