twin

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

Synonyms of twin

• half

Examples of twin in a Sentence

She's the mother of twins.

The twins went swimming after lunch.

My sister just had twins.

Sarah and her brother are twins.

Recent Examples on the Web

Both of the twins are set to graduate in May and June of this year. —Kayla Grant, PEOPLE, 29 May 2026

Senior twins Riley and Reagan Cullivan put off a family vacation to Italy for one day to play in the title game. —Don Norcross, San Diego Union-Tribune, 29 May 2026

Pitt also later joined Jolie in adopting Pax, 22, from Vietnam and Zahara from Ethiopia, while the couple also had three biological children together, Shiloh and twins, Vivienne and Knox. —Martha Ross, Mercury News, 29 May 2026

Talk about twins needing to do everything together. —Steve Millar, Chicago Tribune, 29 May 2026

Word History

Etymology

Middle English, from twin twofold

First Known Use

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

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