**A*rith"me*tic** (#), n. [OE. *arsmetike*, OF. *arismetique*, L. *arithmetica*, fr. Gr. (sc. ), fr. arithmetical, fr. to number, fr. number, prob. fr. same root as E. *arm*, the idea of counting coming from that of fitting, attaching. See Arm. The modern Eng. and French forms are accommodated to the Greek.]

**1.**

The science of numbers; the art of computation by figures.

**2.**

A book containing the principles of this science.

Arithmetic of sines, trigonometry. -- Political arithmetic, the application of the science of numbers to problems in civil government, political economy, and social science. -- Universal arithmetic, the name given by Sir Isaac Newton to algebra.

© Webster 1913.