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

• 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

Simple arithmetic such as 355/113 could be calculated in place by selecting the text and pressing USE FRONT-CALC (Control-G), which yields the answer with a dotted underline to indicate the result of a computation. —Cameron Kaiser, ArsTechnica, 12 Sep. 2025

The arithmetic of the French National Assembly – the key hurdle to getting any budget passed – hasn’t changed with a new prime minister. —Joseph Ataman, CNN Money, 9 Sep. 2025

Readers would not, however, need to know much math beyond basic arithmetic. —Rebecca Coffey, Forbes.com, 8 Sep. 2025

The model appears able to do novel mathematics and accurately answer tough medical questions, but my own and other users’ tests also found that the program could not reliably count the number of B’s in blueberry, generate even remotely accurate maps, or do basic arithmetic. —Matteo Wong, The Atlantic, 21 Aug. 2025

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