twin

1 of 3

noun

ˈtwin 

1

a

: either of two offspring produced in the same pregnancy

b

Twins plural : gemini

2

: one of two persons or things closely related to or resembling each other

3

: a compound crystal composed of two adjoining crystals or parts of crystals of the same kind that share a common plane of atoms

twinship

ˈtwin-ˌship 

noun

twin

2 of 3

adjective

1

: born with one other or as a pair at one birth

my twin brother

twin girls

2

a

: made up of two similar, related, or connected members or parts : double

a twin-engine airplane

b

: paired in a close or necessary relationship : matching

the company's twin goals of greater productivity and profits

c

: having or consisting of two identical units

d

: being one of a pair

twin

3 of 3

verb

twinned; twinning

transitive verb

1

: to bring together in close association : couple

2

: duplicate, match

intransitive verb

1

: to bring forth twins

2

of a crystal : to grow in a compound form with two adjoining sections that share a common plane of atoms

Synonyms of twin

Noun

• half

Adjective

• dual
• binary

Examples of twin in a Sentence

Noun

She's the mother of twins.

The twins went swimming after lunch.

My sister just had twins.

Sarah and her brother are twins.

Adjective

the twin goals of reducing oil dependence and protecting the environment

Recent Examples on the Web

Noun

Michael, who shares his twins with his partner Josh Valdez, 33, explains that nothing seemed to soothe her to sleep. —Kayla Grant, PEOPLE, 5 Dec. 2025

The twins, returning home after enriching themselves in gangland Chicago, open a juke joint and hire a young prodigy and an esteemed elder to perform there. —Justin Chang, New Yorker, 5 Dec. 2025

Adjective

But her reality now is far removed from life as a teacher's aide at her twin daughters’ bilingual school in Milwaukee. —Sophie Carson, jsonline.com, 3 Dec. 2025

On this week’s New Heights, Clooney — who’s been married to Amal since 2014 and shares two twin children with her — went on to share his outlook on spousal tiffs with the Kelce brothers. —Hannah Dailey, Billboard, 3 Dec. 2025

Verb

The pair have welcomed three children together, including daughter Kennedy and twins Parker and Sequoia. —Jordana Comiter, PEOPLE, 1 Dec. 2025

Early conversations with the film’s visual effects supervisor, however, made Arkapaw realize that the compositing required for Jordan’s twinning shots would be compromised by the smaller gauge format, so the decision was made to go with 35mm. —Jim Hemphill, IndieWire, 30 Nov. 2025

Word History

Etymology

Noun

Middle English, from twin twofold

Adjective

Middle English, twofold, double, from Old English twinn; akin to Old Norse tvinnr two by two, Old English twā two

First Known Use

Noun

14th century, in the meaning defined at sense 1a

Adjective

1593, in the meaning defined at sense 1

Verb

14th century, in the meaning defined at transitive sense 1

Phrases Containing twin

• conjoined twin
• fraternal twin
• identical twin
• Siamese twin
• twin bed
• twin-bedded
• twin bill
• twin double
• twin primes
• twin-size
• twin town
• twin-turbo

Rhymes for twin

• been
• bin
• chin
• din
• djinn
• fin
• finn
• gin
• grin
• in
• kin
• linn

Kids Definition

twin

1 of 3 adjective

ˈtwin 

1

: born with one other or as a pair at one birth

my twin brother

twin girls

2

a

: made up of two similar, related, or connected members or parts

b

: being one of a pair

a twin city

twin

2 of 3 verb

twinned; twinning

: to produce or give birth to twins

twin

3 of 3 noun

: either of two offspring produced at a birth compare fraternal twin, identical twin

Medical Definition

twin

1 of 2 adjective

ˈtwin 

: born with one other or as a pair at one birth

a twin brother

twin girls

twin

2 of 2 noun

1

: either of two offspring produced at a birth

2

twins plural : a group of two offspring born at one birth

twinship

-ˌship 

noun