arithmetic

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.

Source: Webster's Revised Unabridged Dictionary (1913), United States public domain. See methodology for full licensing detail. Word validity for game play may differ from any official game dictionary.