Ar'ith-met'ic-al, a.

a. [Lat. arithmeticus, Gr. ἀριθμητικός, from ἀριθμεῖν, to number, from ἀριθμός, number.] Pertaining to arithmetic; according to the rules or method of arithmetic.

Arithmetical complement of a logarithm. See LOGARITHM. — Arithmetical mean. See MEAN. — Arithmetical progression. See PROGRESSION.