What is the meaning of Twin?

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, plans, institutions, people, etc.

Either of two or more things, people, etc. that share a single feature.

A friendly term of address, typically for men.

Contains or comprises a pair

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

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

   A twin crystal.

   A two-engine aircraft.

   Refers to a specific size

   1. A twin-size mattress.
   2. A bed, set of sheets, etc., designed for a twin-size mattress.

   A twin-size mattress.

   A bed, set of sheets, etc., designed for a twin-size mattress.

   To separate, divide.

   To split, part; to go away, depart.

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

   To give birth to twins.

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

   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.

   alternative form of twyn

   alternative form of twinn

   Source: wiktionary.org