Name: Leah
Who is asking: Student
Level: Secondary

Question:
I know that the proper name for the X axis is the abscissa, but, what is the proper name for the Y axis?

You've got the right idea, but more precisely the name abscissa goes with the Cartesian name of a POINT, not with an axis.

The abscissa of a point is its x-coordinate, or first coordinate, the ordinate of a point is its y-coordinate, or second coordinate.

Chris