**Al"go*rism** (#), **Al"go*rithm** (#), n. [OE. *algorism*, *algrim*, *augrim*, OF. *algorisme*, F. *algorithme* (cf. Sp. *algoritmo*, OSp. *alguarismo*, LL. *algorismus*), fr. the Ar. *al*-*Khowarezmi* of Khowarezm, the modern Khiwa, surname of Abu Ja'far Mohammed ben Musa, author of a work on arithmetic early in the 9th century, which was translated into Latin, such books bearing the name *algorismus*. The spelling with *th* is due to a supposed connection with Gr. number.]

**1.**

The art of calculating by nine figures and zero.

**2.**

The art of calculating with any species of notation; as, the **algorithms** of fractions, proportions, surds, etc.

© Webster 1913.