twinning

1. (obsolete outside Scotland) To separate, divide.
2. (obsolete outside Scotland) To split, part; to go away, depart.
3. (usually in the passive) To join, unite; to form links between (now especially of two places in different countries).

   Coventry twinned with Dresden as an act of peace and reconciliation, both cities having been heavily bombed during the war.

4. To be paired or suited.
5. To give birth to twins.
6. To be born at the same birth.

1. Action of the verb to twin
2. Giving birth to twins
3. The pairing of similar objects (such as towns)
4. The formation of twin crystals
5. The conversion of a road into a dual carriageway

adjective

Biparous