# Definition:Abscissa/Historical Note

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## Historical Note on Abscissa

The term **abscissa** was used by Leonardo Fibonacci in his $1220$ work *Practica Geometriae*.

Some sources suggest that the word descends from translations of *Conics* by Apollonius.

Its use in the modern sense, as meaning the $x$ coordinate of a point in a Cartesian plane, may have been due to Stefano degli Angeli in his $1659$ work *Miscellaneum Hyperbolicum, et Parabolicum*.

The term entered the mathematical mainstream via the works of Gottfried Wilhelm von Leibniz, and some suggest that he may even have coined it.

## Sources

- 1992: George F. Simmons:
*Calculus Gems*... (previous) ... (next): Chapter $\text {A}.19$: Leibniz ($1646$ – $1716$)