ordinate
noun
or·di·nate ˈȯr-də-nət 
ˈȯrd-nət,
-ˌnāt
: the Cartesian coordinate obtained by measuring parallel to the y-axis compare abscissa
Word History
Etymology
New Latin (linea) ordinate (applicata), literally, line applied in an orderly manner
First Known Use
1706, in the meaning defined above