noun

The definition of an abscissa is the horizontal coordinate on a geometric plane.

An example of an abscissa is the measurement along the y-axis parallel with the x-axis to point p.

## abscissa

noun

*pl.*-·sas or -·sae

Math. the horizontal Cartesian coordinate on a plane, measured from the y-axis along a line parallel with the x-axis to point P

Origin of abscissa

Classical Latin*abscissa (linea)*, (a line) cut off, feminine of

*abscissus*, past participle of

*abscindere*, to cut off from

*ab-*, from, off +

*scindere*, to cut from Indo-European an unverified form

*skei-*: for base see saw

## abscissa

noun

*pl.*

**ab·scis·sas,**or

**ab·scis·sae**

**x**The coordinate representing the position of a point along a line perpendicular to the

*y*-axis in a plane Cartesian coordinate system.

Origin of abscissa

New Latin*(līnea) abscissa*

*(line) cut off*

*from*Latin

*abscissa*

*feminine past participle of*

*abscindere*

*to abscise*; see

**abscission**.

**abscissa**

The coordinates for A are (4,3); the abscissa is 4 and the ordinate is 3.

## abscissa

Noun

(*plural* abscissas *or* abscissae *or* abscissæ)

- (geometry) The first of the two terms by which a point is referred to, in a system of fixed rectilinear coordinate (Cartesian coordinate) axes. The abscissa is also known as the "x" coordinate of a point, shown on the horizontal line, with the ordinate, also known as the "y" coordinate, shown on the vertical line. [First attested in the late 17
^{th}century.]^{ }*The point has 3 as its abscissa and 2 as its ordinate.*

Usage notes

Originally, it referred to the portion of a line between a fixed point on that line and the intersection of that line with an ordinate.^{ }