D defs.my
Entry 2 senses Webster, 1913

Arithmetic

/ərĭth′mətĭk/ · A·rith·me·tic · IPA /əˈɹɪθmətɪk/
01 n. The science of numbers; the art of computation by figures.
  1. 1.
    The science of numbers; the art of computation by figures.
  2. 2.
    A book containing the principles of this science.
Phrases & compounds
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.