from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. One of two offspring born at the same birth.
  • n. One of two identical or similar people, animals, or things; a counterpart.
  • n. Mineralogy Two interwoven crystals that are mirror images of each other.
  • n. A twin-size bed.
  • adj. Being two or one of two offspring born at the same birth: twin sisters.
  • adj. Being two or one of two identical or similar people, animals, or things: twin cities; a twin bed.
  • adj. Botany Of or relating to structures, such as flowers, that occur in pairs.
  • adj. Consisting of two identical or similar parts: a twin lamp fixture.
  • intransitive v. To give birth to twins.
  • intransitive v. Archaic To be one of twin offspring.
  • intransitive v. To be paired or coupled.
  • transitive v. To pair or couple.
  • transitive v. To provide a match or counterpart to.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. 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.
  • n. Either of two similar or closely related objects, entities etc.
  • n. A room in a hotel, guesthouse, etc. with two beds; a twin room.
  • n. A twin size mattress or a bed designed for such a mattress.
  • n. A twin crystal.
  • n. Forming a pair of twins.
  • n. Forming a matched pair.
  • v. To separate, divide.
  • v. To split, part; to go away, depart.
  • v. To join, unite; to form links between (now especially of two places in different countries).
  • v. To give birth to twins.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Being one of two born at a birth.
  • adj. Being one of a pair much resembling one another; standing in the relation of a twin to something else; -- often followed by to or with.
  • adj. Double; consisting of two similar and corresponding parts.
  • adj. Composed of parts united according to some definite law of twinning. See Twin, n., 4.
  • n. One of two produced at a birth, especially by an animal that ordinarily brings forth but one at a birth; -- used chiefly in the plural, and applied to the young of beasts as well as to human young.
  • n. A sign and constellation of the zodiac; Gemini. See Gemini.
  • n. A person or thing that closely resembles another.
  • n. A compound crystal composed of two or more crystals, or parts of crystals, in reversed position with reference to each other.
  • intransitive v. To bring forth twins.
  • intransitive v. To be born at the same birth.
  • intransitive v. To depart from a place or thing.
  • transitive v. To cause to be twins, or like twins in any way.
  • transitive v. To separate into two parts; to part; to divide; hence, to remove; also, to strip; to rob.

from The Century Dictionary and Cyclopedia

  • To cut or form in pairs by cutters or chisels.
  • Two; twain.
  • Consisting of two separate, closely related, and equal members; twofold; double; specifically, consisting of or forming twins or a pair: as, twin children.
  • One, each, or either of two; one of a pair, specifically of two born at a birth: as, a twin brother or sister.
  • In botany, growing in pairs; didymous.
  • Consisting of two chief parts alike, or nearly alike, and held firmly together: as, a twin bottle; a twin vase. The plural is used in the same sense: as, twin vases.
  • In entomology, geminate: applied to spots, punctures, spines, etc., which are close together in pairs, and distant from others.
  • n. Two; twain; a pair; a couple.
  • n. One of two; one of a pair or couple linked together by a particular tie or relation; the mate, counterpart, or fellow of another; specifically, one of two creatures produced at a birth: said of the young both of hitman beings and of beasts.
  • n. A compound crystal one part of which is in a reversed position with reference to the other, as if it had been revolved through 180° about an axis (twinning-axis) perpendicular to a plane which is called the twinning-plane, and is usually a fundamental plane of the given Crystal.
  • To couple; pair; mate; join intimately or link together; said of two united or of one joined to another.
  • Specifically, in mineralogy, to form or unite into a compound or twin crystal by a reversal of the molecular structure according to some definite law.
  • To be coupled or paired; be mated, as one with another; specifically, to be twin-born.
  • To bring forth two at a birth.
  • To be parted in twain; be divided or sundered; come apart.
  • To part; depart; go away.
  • To be separated (from) or deprived (of): as, to twin with one's gear.
  • To part in twain; sever; sunder.
  • To part, as from another person or thing; separate; sunder; especially, to deprive.
  • n.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. bring two objects, ideas, or people together
  • n. a waterfall in the Snake River in southern Idaho
  • n. a duplicate copy
  • adj. being two identical
  • v. give birth to twins
  • v. grow as twins
  • n. either of two offspring born at the same time from the same pregnancy
  • n. (astrology) a person who is born while the sun is in Gemini
  • v. duplicate or match


from The American Heritage® Dictionary of the English Language, 4th Edition

Middle English, from Old English twinn, twofold.

from Wiktionary, Creative Commons Attribution/Share-Alike License

Old English twinn, earlier ġetwinn, from Germanic.


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