Abscissae
Abscissae
Abscissae (pronunciation: /æbˈsɪsiː/; singular: abscissa) is a term used in mathematics, specifically in Cartesian coordinates, to denote the horizontal or x-coordinate of a point in a two-dimensional plane.
Etymology
The term "abscissae" originates from the Latin word "abscissa", which means "cut off". It was first used in this context by the mathematicians of the 17th century.
Definition
In a Cartesian coordinate system, the abscissae of a point is the distance from the vertical y-axis to the point, measured along the horizontal x-axis. It is usually represented as the first element in an ordered pair (x, y), where 'x' is the abscissae and 'y' is the ordinate.
Related Terms
- Cartesian coordinate system: A coordinate system that specifies each point uniquely in a plane by a pair of numerical coordinates, which are the signed distances to the point from two fixed perpendicular directed lines, measured in the same unit of length.
- Ordinate: In a Cartesian coordinate system, the ordinate of a point is the distance from the horizontal x-axis to the point, measured along the vertical y-axis.
- Coordinate: A set of values that show an exact position.
- Axis: A reference line from which distances or angles are measured in a coordinate system.
External links
- Medical encyclopedia article on Abscissae
- Wikipedia's article - Abscissae
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