- 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.

## arithmetic

noun

- the science or art of computing by positive real numbers, specif. by adding, subtracting, multiplying, and dividing
- knowledge of or skill in this science: her
*arithmetic*is poor

Origin of arithmetic

Middle English*arsmetrike*; from Old French

*arismetrique*(infl. in form by Classical Latin

*ars metrica*, the art of measurement) ; from Classical Latin

*arithmetica*; from Classical Greek (

*hē) arithmētikē (technē*), (the) counting (art) ; from

*arithmētikos*, arithmetical ; from

*arithmein*, to count ; from

*arithmos*, number

adjective

of, based on, or using arithmetic

also arithmetical

*Related Forms:*

- arithmetically
adverb

## arithmetic

noun

The mathematics of integers, rational numbers, real numbers, or complex numbers under addition, subtraction, multiplication, and division.

adjective

**ar·ith·met·ic**also

**ar′ith·met′i·cal**

- Of or relating to arithmetic.
- Changing according to an arithmetic progression:
*The increase in the food supply is arithmetic.*

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*; see

*ar-*in Indo-European roots.

*Related Forms:*

**ar′ith·met′i·cal·ly**adverb

**a·rith′me·ti′cian**noun

## arithmetic

Noun

(*uncountable*)

- The mathematics of numbers (integers, rational numbers, real numbers, or complex numbers) under the operations of addition, subtraction, multiplication, and division.

Adjective

(*not comparable*)

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

- (arithmetic) Of a progression, mean, etc, computed using addition rather than multiplication.
*arithmetic progression*

Antonyms

- (of or relating to arithmetic): arithmetical
- (computed using addition rather than multiplication): geometric

Origin

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.