abscissa

/รฆbหˆsษชs.ษ™/
noun
  1. 1

    The first of the two terms by which a point is referred to, in a system of fixed rectilinear coordinate (Cartesian coordinate) axes.

  2. 2

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

Synonyms

Source: https://en.wiktionary.org/wiki/abscissa