Meaning

• Either of two people (or, less commonly, animals) who shared the same uterus at the same time; one who was born at the same birth as a sibling.

• Either of two similar or closely related objects, entities etc.

• A room in a hotel, guesthouse, etc. with two beds; a twin room.

• A twin size mattress or a bed designed for such a mattress.

• A twin crystal.

Meaning

• (obsolete outside Scotland) To separate, divide.

• (obsolete outside Scotland) To split, part; to go away, depart.

• (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."

• To be paired or suited.

• To give birth to twins.

• To be born at the same birth.