1. the method or process of computation with figures: the most elementary branch of mathematics.
2. Also called higher arithmetic, theoretical arithmetic. the theory of numbers; the study of the divisibility of whole numbers, the remainders after division, etc.
3. a book on this subject.
Also,ar"ith•met'i•cal.of or pertaining to arithmetic.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.