# Definition:Ordinate

## Definition

Consider the graph $y = \map f x$ of a real function $f$ embedded in a Cartesian plane.

The $y$ coordinate of a point $P = \tuple {x, y}$ on $f$ is known as the ordinate of $P$.

## Historical Note

The term ordinate entered the mathematical mainstream via the works of Gottfried Wilhelm von Leibniz, and some suggest that he may even have coined it.