#abscissa

• Abscissa / Horizontal axis — The first coordinate of a point in a two-dimensional Cartesian coordinate system (the Ox axis), frequently used in medical graphs, epidemiological studies, and statistical charts to plot the independent variable (e.g., time, drug dosage, or age).
• abscissa — (Mathematics) The first coordinate of a point in a plane or spatial Cartesian coordinate system, representing the distance measured from the vertical axis (ordinate) along the horizontal axis (Ox axis).