■ noun
1》 one of two children or animals born at the same birth.
2》 something containing or consisting of two matching or corresponding parts.
■ adjective
1》 forming or being one of a ~.
2》 forming a matching or closely connected pair.
3》 (of a crystal) ~ned.
■ verb ( ~s , ~ning , ~ned )
1》 link; combine.
↘ Brit. link (a town or district) with another in a different country, for the purposes of cultural exchange.
2》 [as adjective ~ned ] (of a crystal) that is a composite consisting of two (or more) parts which are reversed in orientation with respect to each other.
Derivatives
~ned adjective
~ning noun
Origin
OE ~n 'double', from twi- 'two'; related to ON tvinnr .