twin Meaning in the Cambridge English Dictionary
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Meaning of “twin” in the English Dictionary

"twin" in British English

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twinnoun [C]

uk   us   /twɪn/
B1 either of two ​childrenborn to the same ​mother on the same ​occasion: My ​sister has twin ​sons. a twin ​sister one of two very ​similar things: The two ​countries are often ​regarded as ​economic twins.
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twinadjective [before noun]

uk   us   /twɪn/
used to ​describe two ​similar things that are a ​pair: twin ​towers a ​car with twin ​exhausts existing at the same ​time: his twin ​obsessions - women and ​cars

twinverb

uk   us   /twɪn/ UK
be twinned with If a ​town in one ​country is twinned with a ​town in another ​country, the two ​towns have a ​specialrelationship: Cambridge is twinned with Heidelberg.
(Definition of twin from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"twin" in American English

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twinnoun [C]

 us   /twɪn/
either of two ​childrenborn to the same ​mother on the same ​occasion

twinadjective [not gradable]

 us   /twɪn/
Twin is used of two things that are the same or ​similar: twin ​engines/​towers
(Definition of twin from the Cambridge Academic Content Dictionary © Cambridge University Press)
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