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See also: Twin


Alternative forms[edit]


  • enPR: twĭn, IPA(key): /twɪn/, [tw̥ɪn]
  • (file)
  • Rhymes: -ɪn

Etymology 1[edit]

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 *twinjaz, *twinaz (two each), from Proto-Indo-European *dwino- (twin), from *dwóh₁ (two). Cognate with Scots twyn (twin), Dutch tweeling (twin), German Zwilling (twin), Swedish tvilling (twin), Faroese tvinnur (a double set), Icelandic tvenna (duo, pair), Lithuanian dvynys (twin), Russian двойня (dvojnja, twin).


twin (plural twins)

  1. 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.
  2. Either of two similar or closely related objects, entities etc.
  3. A room in a hotel, guesthouse, etc. with two beds; a twin room.
  4. (US) A twin size mattress or a bed designed for such a mattress.
  5. (aviation) A two-engine aircraft.
  6. (crystallography) A twin crystal.
Derived terms[edit]
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twin (third-person singular simple present twins, present participle twinning, simple past and past participle twinned)

  1. (transitive, obsolete outside Scotland) To separate, divide.
  2. (intransitive, obsolete outside Scotland) To split, part; to go away, depart.
  3. (usually in the passive) To join, unite; to form links between (now especially of two places in different countries).
    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.
  4. (intransitive) To be paired or suited.
  5. (intransitive) To give birth to twins.
    • 1874, Thomas Hardy, Far from the Madding Crowd:
      “I’ve run to tell ye,” said the junior shepherd, supporting his exhausted youthful frame against the doorpost, “that you must come directly. Two more ewes have twinned — that’s what’s the matter, Shepherd Oak.”
  6. (intransitive, obsolete) To be born at the same birth.
See also[edit]

Etymology 2[edit]

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).


twin (not comparable)

  1. double; dual; occurring as a matching pair
    twin beds, twin socks
  2. forming a pair of twins.
    the twin boys
Derived terms[edit]

Further reading[edit]


Old English[edit]




  1. Alternative form of twinn