Abscissa

Noun

1. The first of the two terms by which a point is referred to, in a system of fixed rectilinear coordinate (Cartesian coordinate) axes. .mw-parser-output .defdate{font-size:smaller}

   "The point ( 3 , 2 ) {\displaystyle (3,2)} has 3 as its abscissa and 2 as its ordinate."

2. The horizontal line representing an axis of a Cartesian coordinate system, on which the abscissa (sense above) is shown.