arithmetic

noun

arith·​me·​tic ə-ˈrith-mə-ˌtik 

1

a

: a branch of mathematics that deals usually with the nonnegative real numbers including sometimes the transfinite cardinals and with the application of the operations of addition, subtraction, multiplication, and division to them

b

: a treatise on arithmetic

2

: computation, calculation

arithmetic

ˌer-ith-ˈme-tik 

ˌa-rith-

adjective

or arithmetical

ˌer-ith-ˈme-ti-kəl 

ˌa-rith-

arithmetically

ˌer-ith-ˈme-ti-k(ə-)lē 

ˌa-rith-

adverb

arithmetician

ə-ˌrith-mə-ˈti-shən 

noun

Synonyms of arithmetic

• math
• calculation
• mathematics

Examples of arithmetic in a Sentence

a software program that will do the arithmetic for you

I haven't actually done the arithmetic yet, but I suspect we're losing money on the deal.

Recent Examples on the Web

Swagel cautioned against doing arithmetic on the fly but offered some back-of-the-envelope numbers. — Jason Ma, Fortune, 10 Oct. 2026

Multiplying two matrices together requires a tedious amount of arithmetic. — Joseph Howlett, Scientific American, 8 Oct. 2026

The costs of starting over Even with roots to work from, however, the arithmetic of recovery is sobering. — Ghada Abdulfattah, Christian Science Monitor, 2 Oct. 2026

Yet although supplying air defenses is essential, protecting Ukraine’s skies cannot be the only strategy, because of simple arithmetic. — Dmytro Kuleba, Foreign Affairs, 30 Sep. 2026

Word History

Etymology

Middle English arsmetrik, from Anglo-French arismatike, from Latin arithmetica, from Greek arithmētikē, from feminine of arithmētikos arithmetical, from arithmein to count, from arithmos number; akin to Old English rīm number, and perhaps to Greek arariskein to fit

First Known Use

15th century, in the meaning defined at sense 1a

Phrases Containing arithmetic

• arithmetic average
• arithmetic mean
• arithmetic progression
• arithmetic scale
• modular arithmetic

Rhymes for arithmetic

• alphabetic
• anaesthetic
• anesthetic
• antithetic
• apathetic
• cybernetic
• diabetic
• dietetic
• diuretic
• empathetic
• energetic
• geodetic

Kids Definition

arithmetic

noun

arith·​me·​tic ə-ˈrith-mə-ˌtik 

1

: a branch of mathematics that deals with real numbers and their addition, subtraction, multiplication, and division

2

: an act or method of computing

arithmetic

ˌar-ith-ˈmet-ik 

adjective

or arithmetical

-ˈmet-i-kəl 

arithmetically

-i-k(ə-)lē 

adverb

arithmetician

ə-ˌrith-mə-ˈtish-ən 

noun