What is the meaning of Absis?

Alternative spelling of apsis

apse

abscissa

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

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

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

second-person singular present active subjunctive of absum

dative/ablative masculine/feminine/neuter plural of absus

dative/ablative plural of absus

Source: wiktionary.org