Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: twinn 'double'

twin

2 adjective
     
twin2 [only before noun]
1 used to describe one of two children who are twins
twin sister/brother
Meet my twin sister.
2 used to describe two things that happen at the same time and are related to each other:
the twin problems of poverty and unemployment
3

twin room/bedroom

a room that contains two single beds:
All the twin rooms have private bathrooms.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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