(baseball) A player who plays for the Minnesota Twins.

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.

(US) A twin size mattress or a bed designed for such a mattress.

(aviation) A two-engine aircraft.

(crystallography) A twin crystal.

(usually in the passive) To join, unite; to form links between (now especially of two places in different countries); to pair with.

(intransitive) To give birth to twins.

(transitive) To be, or be like, a twin to (someone else); to match in some way.

(intransitive) To be, or be like, a pair of twins (for example, to dress identically); to be paired or suited.

Double; dual; occurring as a matching pair.

Forming a pair of twins.