arithmetic
arith.me.tic or ar.ith.met.i.cal \*-'rith-m*-.tik\ \.ar-ith-'met-ik\ \-i-k*l\ \-k(*-)le-\ \*-.rith-m*-'tish-*n\ n [ME arsmetrik, fr. OF arismetique, fr. L arithmetica, fr. Gk]arithme-tike-, fr. fem. of arithme-tikos arithmetical, fr. arithmein to count, fr. arithmos number; akin to Gk arariskein to fit 1a: a branch of mathematics that deals with real numbers and computations with them 1b: a treatise on arithmetic 2: COMPUTATION, CALCULATION - ar.ith.met.i.c aj