twin.
Either of two people (or, less commonly, animals) who shared the same uterus at the same time; one who was born at the same birth as a sibling.
Meaning & usage
Either of two people (or, less commonly, animals) who shared the same uterus at the same time; one who was born at the same birth as a sibling.
twin girls, twin daughters, twin sisters, twin boys, twin sons, twin brothers, twin babies, twin children
Katie is Jessica's twin.
Either of two similar or closely related objects, plans, institutions, people, etc.
Your idea is the twin of mine.
Either of two similar or closely related objects, plans, institutions, people, etc. Either of two or more things, people, etc. that share a single feature.
He is my twin (wearing the same shirt, driving the same car, etc.).
Either of two similar or closely related objects, plans, institutions, people, etc. A friendly term of address, typically for men.
Yo, twin, lemme rap at ya.
Contains or comprises a pair A room in a hotel, guesthouse, etc. with two beds; a twin room.
Contains or comprises a pair A twin crystal.
Contains or comprises a pair A two-engine aircraft.
Refers to a specific size A twin-size mattress.
Refers to a specific size A bed, set of sheets, etc., designed for a twin-size mattress.
Where this word comes from
PIE word *dwóh₁ From Middle English twinne, twynne, from Old English ġetwin, ġetwinn (“twin, multiple”, noun) and twinn (“twin, two-fold, double, two by two”, adjective), from Proto-Germanic *twinaz (“double/two each, twin”), Proto-Germanic *twinjaz, *twīhnaz (“two each”), from Proto-Indo-European *dwino- (“twin”), from *dwóh₁ (“two”). Cognate with Scots twyn (“twin”), Dutch tweeling (“twin”), German Zwilling (“twin”), Danish, Norwegian Bokmål, Norwegian Nynorsk, and Swedish tvilling (“twin”), Faroese tvinnur (“a double set”), Icelandic tvenna (“duo, pair”), Lithuanian dvynys (“twin”), Russian двойня (dvojnja, “twin”).
To separate, divide.
To split, part; to go away, depart.
To join, unite; to form links between (now especially of two places in different countries); to pair with.
Reading, the English town, is twinned with Clonmel in Ireland.
Coventry twinned with Dresden as an act of peace and reconciliation, both cities having been heavily bombed during the war.
To give birth to twins.
To be, or be like, a twin to (someone else); to match in some way.
To be, or be like, a pair of twins (for example, to dress identically); to be paired or suited.
Where this word comes from
PIE word *dwóh₁ From Middle English twinne, twynne, from Old English ġetwin, ġetwinn (“twin, multiple”, noun) and twinn (“twin, two-fold, double, two by two”, adjective), from Proto-Germanic *twinaz (“double/two each, twin”), Proto-Germanic *twinjaz, *twīhnaz (“two each”), from Proto-Indo-European *dwino- (“twin”), from *dwóh₁ (“two”). Cognate with Scots twyn (“twin”), Dutch tweeling (“twin”), German Zwilling (“twin”), Danish, Norwegian Bokmål, Norwegian Nynorsk, and Swedish tvilling (“twin”), Faroese tvinnur (“a double set”), Icelandic tvenna (“duo, pair”), Lithuanian dvynys (“twin”), Russian двойня (dvojnja, “twin”).
Double; dual; occurring as a matching pair.
twin beds, twin socks
Forming a pair of twins.
the twin boys
Where this word comes from
From Middle English *twin, *twyn, from Old English twin, twinn (“twin; double”, adjective), from Proto-Germanic *twīhnaz (“occurring in a pair; twofold; double”), from Proto-Indo-European *dwóh₁ (“two”). Cognate with Icelandic tvennur (“double”), Gothic 𐍄𐍅𐌴𐌹𐌷𐌽𐌰𐌹 (tweihnai, “two each”).
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.