ordinate axis, line of departure, axis of ordinates
ristkoordinaadistiku vertikaalne telg, in the coordinate system, the term “ordinate axis” refers to the y-coordinate in (x, y); in short, the distance along the y-axis is called the ordinate, koordinaatsüsteemis viitab termin "ordinaattelg" y-koordinaadile, ehk lühidalt öeldes kaugus piki y-telge on ordinaat