# Arithmetic definition

ə-rĭthmĭ-tĭk
Frequency:
The mathematics of integers, rational numbers, real numbers, or complex numbers under addition, subtraction, multiplication, and division.
noun
Changing according to an arithmetic progression.

The increase in the food supply is arithmetic.

Of or relating to arithmetic.
The science or art of computing by positive real numbers, specif. by adding, subtracting, multiplying, and dividing.
noun
The mathematics of integers, rational numbers, real numbers, or complex numbers under the operations of addition, subtraction, multiplication, and division.
The definition of arithmetic refers to working with numbers by doing addition, subtraction, multiplication, and division.

An example of arithmetic is adding two and two together to make four.

noun
The mathematics of numbers (integers, rational numbers, real numbers, or complex numbers) under the operations of addition, subtraction, multiplication, and division.
noun
Knowledge of or skill in this science.

Her arithmetic is poor.

noun
Of, based on, or using arithmetic.
(arithmetic) Of a progression, mean, etc, computed solely using addition.

Arithmetic progression.

(mathematics) Of, relating to, or using arithmetic; arithmetical.

Arithmetic geometry.

Singular:
arithmetic
Plural:
arithmetics

## Origin of 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 ar- in Indo-European roots

### From American Heritage Dictionary of the English Language, 5th Edition

• From Middle English arsmetike, from Old French arismetique, from Latin arithmetica, from Ancient Greek ἀριθμητική (arithmētikē, “counting”) (τέχνη (tekhnē, “art”)), from ἀριθμός (arithmos, “number”). Used in English since 13th Century.