̘. ̈n.əˈrɪθmətɪk n. & adj. --n. 1 a
the science of numbers. b one's
knowledge of
this (have improved my arithmetic). 2 the
use of numbers; computation (a
problem involving arithmetic). --adj. (also arithmetical) of or
concerning arithmetic. øarithmetic mean the
central number in an arithmetic
progression. arithmetic progression 1 an
increase or
decrease by a
constant quantity (e.g. 1, 2, 3, 4,
etc., 9, 7, 5, 3, etc.). 2 a
sequence of numbers
showing this. øøarithmetician n. [ME f. OF arismetique f. L arithmetica f. Gk arithmetike (tekhne) art of counting f. arithmos number]