1.  twin(n = noun.person) - either of two offspring born at the same time from the same pregnancy;
is a kind of sib, sibling
has particulars: dizygotic twin, fraternal twin, identical twin, monozygotic twin, monozygous twin
Derived form verb twin₄

2.  twin(n = noun.person) gemini - (astrology) a person who is born while the sun is in Gemini;
is a kind of individual, mortal, person, somebody, someone, soul

3.  twin(n = noun.object) twin falls - a waterfall in the Snake River in southern Idaho;
is a kind of falls, waterfall
is a part of america, the states, u.s., u.s.a., united states, united states of america, us, usa, snake, snake river

4.  twin(n = noun.artifact) counterpart, similitude - a duplicate copy;
is a kind of duplicate, duplication
Derived form verb twin₁

1.  twin(v = verb.stative) duplicate, parallel - duplicate or match; "The polished surface twinned his face and chest in reverse"
is one way to agree, check, correspond, fit, gibe, jibe, match, tally
Derived form noun twin₄
Sample sentences: Something ----s something

2.  twin(v = verb.contact) couple, match, mate, pair - bring two objects, ideas, or people together; "This fact is coupled to the other one"; "Matchmaker, can you match my daughter with a nice young man?"; "The student was paired with a partner for collaboration on the project"
is one way to bring together, join
Sample sentences: Somebody ----s something; Somebody ----s somebody

3.  twin(v = verb.change) - grow as twins; "twin crystals"
is one way to grow
Sample sentences: Something ----s

4.  twin(v = verb.body) - give birth to twins;
is one way to bear, birth, deliver, give birth, have
Derived form noun twin₁
Sample sentences: Somebody ----s

   twin(s = adj.all) duplicate, matching, twinned - being two identical;

1.  Being one of two born at a birth; as, a twin brother or sister. [1913 Webster]

2.  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. Shak. [1913 Webster]

3.  Double; consisting of two similar and corresponding parts. [1913 Webster]

4.  Composed of parts united according to some definite law of twinning. See Twin, n., 4. [1913 Webster]

1.  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. [1913 Webster]

2.  A sign and constellation of the zodiac; Gemini. See Gemini. [1913 Webster]

3.  A person or thing that closely resembles another. [1913 Webster]

4.  A compound crystal composed of two or more crystals, or parts of crystals, in reversed position with reference to each other. [1913 Webster]
" The relative position of the parts of a twin may be explained by supposing one part to be revolved 180twinning axis), this axis being normal to a plane (called the twinning plane) which is usually one of the fundamental planes of the crystal. This revolution brings the two parts into parallel position, or vice versa. A contact twin is one in which the parts are united by a plane surface, called the composition face, which is usually the same as the twinning plane. A penetration twin is one in which the parts interpenetrate each other, often very irregularly. Twins are also called, according to form, cruciform, geniculated, etc." [1913 Webster]

1.  To bring forth twins. Tusser. [1913 Webster]

2.  To be born at the same birth. Shak. [1913 Webster]

1.  To cause to be twins, or like twins in any way. Shak. [1913 Webster]
"Still we moved
Together, twinned, as horse's ear and eye." [1913 Webster]

2.  To separate into two parts; to part; to divide; hence, to remove; also, to strip; to rob. [1913 Webster]
"The life out of her body for to twin." [1913 Webster]

   To depart from a place or thing. Chaucer. [1913 Webster]

twin, n., adj., & v.
--n.
1 each of a closely related or associated pair, esp. of children or animals born at a birth.
2 the exact counterpart of a person or thing.
3 a compound crystal one part of which is in a reversed position with reference to the other.
4 (the Twins) the zodiacal sign or constellation Gemini.
--adj.
1 forming, or being one of, such a pair (twin brothers).
2 Bot. growing in pairs.
3 consisting of two closely connected and similar parts.
--v. (twinned, twinning)
1 tr. & intr. a join intimately together. b (foll. by with) pair.
2 intr. bear twins.
3 intr. grow as a twin crystal.
4 intr. & tr. Brit. link or cause (a town) to link with one in a different country, for the purposes of friendship and cultural exchange.

Idiom:
twin bed each of a pair of single beds. twin-engined having two engines. twin-screw (of a ship) having two propellers on separate shafts with opposite twists. twin set esp. Brit. a woman's matching cardigan and jumper. twin town Brit. a town which is twinned with another.

Derivative:
twinning n.

Etymology:
OE twinn double, f. twi- two: cf. ON tvinnr

N  similarity, resemblance, likeness, similitude, semblance, affinity, approximation, parallelism, agreement, analogy, analogicalness, correspondence, homoiousia, parity, connaturalness, connaturality, brotherhood, family likeness, alliteration, rhyme, pun, repetition, sameness, uniformity, isogamy, analogue, the like, match, pendant, fellow companion, pair, mate, twin, double, counterpart, brother, sister, one's second self, alter ego, chip of the old block, par nobile fratrum, Arcades ambo, birds of a feather, et hoc genus omne, gens de meme famille, parallel, simile, type, image, photograph, close resemblance, striking resemblance, speaking resemblance, faithful likeness, faithful resemblance, similar, resembling, like, alike, twin, analogous, analogical, parallel, of a piece, such as, so, homoiousian, connatural, congener, allied to, akin to, approximate, much the same, near, close, something like, sort of, in the ballpark, such like, a show of, mock, pseudo, simulating, representing, exact, lifelike, faithful, true to nature, true to life, the very image, the very picture of, for all the world like, comme deux gouttes d'eau, as like as two peas in a pod, as like as it can stare, instar omnium, cast in the same mold, ridiculously like, as if, so to speak, as it were, as if it were, quasi, just as, veluti in speculum, et sic de similibus, tel maitre tel valet, tel pere tel fils, like master, like servant, like father, like son, the fruit doesn't fall far from the tree, a chip off the old block, similarity, resemblance, likeness, similitude, semblance, affinity, approximation, parallelism, agreement, analogy, analogicalness, correspondence, homoiousia, parity, connaturalness, connaturality, brotherhood, family likeness, alliteration, rhyme, pun, repetition, sameness, uniformity, isogamy, analogue, the like, match, pendant, fellow companion, pair, mate, twin, double, counterpart, brother, sister, one's second self, alter ego, chip of the old block, par nobile fratrum, Arcades ambo, birds of a feather, et hoc genus omne, gens de meme famille, parallel, simile, type, image, photograph, close resemblance, striking resemblance, speaking resemblance, faithful likeness, faithful resemblance, similar, resembling, like, alike, twin, analogous, analogical, parallel, of a piece, such as, so, homoiousian, connatural, congener, allied to, akin to, approximate, much the same, near, close, something like, sort of, in the ballpark, such like, a show of, mock, pseudo, simulating, representing, exact, lifelike, faithful, true to nature, true to life, the very image, the very picture of, for all the world like, comme deux gouttes d'eau, as like as two peas in a pod, as like as it can stare, instar omnium, cast in the same mold, ridiculously like, as if, so to speak, as it were, as if it were, quasi, just as, veluti in speculum, et sic de similibus, tel maitre tel valet, tel pere tel fils, like master, like servant, like father, like son, the fruit doesn't fall far from the tree, a chip off the old block.

N  accompaniment, adjunct, context, appendage, appurtenance, coexistence, concomitance, company, association, companionship, partnership, copartnership, coefficiency, concomitant, accessory, coefficient, companion, buddy, attendant, fellow, associate, friend, colleague, consort, spouse, mate, partner, co-partner, satellite, hanger on, fellow-traveller, shadow, escort, cortege, attribute, accompanying, concomitant, fellow, twin, joint, associated with, coupled with, accessory, attendant, obbligato, with, withal, together with, along with, in company with, hand in hand, side by side, cheek by jowl, cheek by jole, arm in arm, therewith, herewith, and, together, in a body, collectively, noscitur a sociis, virtutis fortuna comes.

N  duality, dualism, duplicity, biplicity, biformity, polarity, two, deuce, couple, duet, brace, pair, cheeks, twins, Castor and Pollux, gemini, Siamese twins, fellows, yoke, conjugation, dispermy, doublets, dyad, span, two, twin, dual, dualistic, double, binary, binomial, twin, biparous, dyadic, conduplicate, duplex, biduous, binate, diphyletic, dispermic, unijugate, tete-a-tete, coupled, conjugate, both, both the one and the other, duality, dualism, duplicity, biplicity, biformity, polarity, two, deuce, couple, duet, brace, pair, cheeks, twins, Castor and Pollux, gemini, Siamese twins, fellows, yoke, conjugation, dispermy, doublets, dyad, span, two, twin, dual, dualistic, double, binary, binomial, twin, biparous, dyadic, conduplicate, duplex, biduous, binate, diphyletic, dispermic, unijugate, tete-a-tete, coupled, conjugate, both, both the one and the other.

N  duplication, doubling, gemination, ingemination, reduplication, iteration, renewal, double, doubled, bicipital, bicephalous, bidental, bilabiate, bivalve, bivalvular, bifold, biform, bilateral, bifarious, bifacial, twofold, two-sided, disomatous, duplex, double-faced, double-headed, twin, duplicate, ingeminate, second, twice, once more, over again, as much again, twofold, secondly, in the second place, again.

conjoined twin, dizygotic twin, fraternal twin, identical twin, monozygotic twin, monozygous twin, siamese twin, twin bed, twin bill, twin cities, twin falls, twin towers