The mathematics of integers, rational numbers, real numbers, or complex numbers under addition, subtraction, multiplication, and division.
Archaic A book on this kind of mathematics.
adj.
ar·ith·met·ic (ār'ĭth-mět'ĭk) also ar'ith·met'i·cal (ār'ĭth-mět'ĭ-kəl)
Of or relating to arithmetic.
Changing according to an arithmetic progression: The increase in the food supply is arithmetic.
[Middle English arsmetike, from Old French arismetique, from Medieval Latin arismetica, alteration of Latin arithmētica, from Greek arithmētikē (tekhnē), (art) of counting, feminine of arithmētikos, from arithmein, to count, from arithmos, number; see ar- in Indo-European roots.] ar'ith·met'i·cal·ly adv., a·rith'me·ti'cian (-tĭsh'ən) n.