binary

noun

bi·​na·​ry ˈbī-nə-rē How to pronounce binary (audio) -ˌner-ē How to pronounce binary (audio)
-ˌne-rē
plural binaries
Synonyms of binarynext
1
: something made of two things or parts
specifically : binary star
2
mathematics : a number system based only on the numerals 0 and 1 : a binary (see binary entry 2 sense 3a) number system
42 is written as 101010 in binary.
3
: a division into two groups or classes that are considered diametrically opposite
Sam Killermann, a self-described "social justice comedian," is very serious about how far the complexities of identity go beyond the traditional binary of male or female.Katy Steinmetz

Did you know?

The animals went in two by two, the elephant and the kangaroo. . .. It was a binary parade of sorts that went into Noah's ark "for to get out of the rain" - the critters were represented in pairs. If you recall those partnered beasts, you'll remember the etymology of binary, because it traces to the Latin bini, which translates as "two by two." Although "binary" can be used for anything with two parts, it is now used especially in relation to computers and information processing. Digital computers use the binary number system, which includes only the digits 0 and 1, to process even complex data. In binary form, for instance, the word HELLO looks like this: 1001000 1000101 1001100 1001100 1001111.

Examples of binary in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
The third star could have its own planets, but again the binary would make any on larger orbits unstable. Keith Cooper, Space.com, 3 June 2026 The yellow stripe represents genders that aren't inside the binary, the white stripe is for people of any gender, the black stripe symbolizes a lack of gender, and the purple stripe relates to a mix of genders. Nicole Harris, Parents, 2 June 2026 These false binaries were always limiting. Maria Ross, Forbes.com, 1 June 2026 Qubits, the basic components of information in a quantum computer, don’t exist in a binary. Adam Kovac, Scientific American, 27 May 2026 See All Example Sentences for binary

Word History

Etymology
First Known Use

15th century, in the meaning defined at sense 1

Time Traveler
The first known use of binary was in the 15th century

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Cite this Entry

“Binary.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/binary. Accessed 9 Jun. 2026.

Kids Definition

binary

adjective
bi·​na·​ry
ˈbī-nə-rē
1
: compounded or consisting of or marked by two things or parts
2
: relating to, being, or belonging to a system of numbers having two as its base
the binary digits 0 and 1
3
: relating exactly two mathematical or logical elements at a time
multiplication is a binary operation

Medical Definition

binary

adjective
bi·​na·​ry ˈbī-nə-rē How to pronounce binary (audio) -ˌner-ē How to pronounce binary (audio)
1
: compounded or consisting of or marked by two things or parts
2
a
: composed of two chemical elements, an element and a radical that acts as an element, or two such radicals
b
: utilizing two harmless ingredients that upon combining form a lethal substance (as a gas)

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