twin twin /ˈtwɪn/

adjective

1. () Being two identical  ( duplicate , twinned , twin , matching )
   being two identical
   

noun

1. () Either of two offspring born at the same time from the same pregnancy  ( twin )
   either of two offspring born at the same time from the same pregnancy
    It's always fun to see the reaction of people when they first meet my twin brother, they can't believe how much we look alike!
   It's always fun to see the reaction of people when they first meet my twin brother, they can't believe how much we look alike!
   
   
2. A duplicate copy  ( similitude , twin , counterpart )
   a duplicate copy
   

verb

1. Give birth to twins  ( twin )
   give birth to twins
   
2. Grow as twins  ( twin )
   grow as twins
    Twin crystals
   twin crystals
   
3. Bring two objects, ideas, or people together  ( twin , mate , pair , couple , match )
   bring two objects, ideas, or people together
    This fact is coupled to the other one
   This fact is coupled to the other one
    Matchmaker, can you match my daughter with a nice young man?
   Matchmaker, can you match my daughter with a nice young man?
    The student was paired with a partner for collaboration on the project
   The student was paired with a partner for collaboration on the project
   
4. Duplicate or match  ( duplicate , parallel , twin )
   duplicate or match
    The polished surface twinned his face and chest in reverse
   The polished surface twinned his face and chest in reverse
   

 Twin

noun

1. A waterfall in the Snake River in southern Idaho  ( Twin , Twin Falls )
   a waterfall in the Snake River in southern Idaho
   
   
2. (astrology) a person who is born while the sun is in Gemini  ( Gemini , Twin )
   (astrology) a person who is born while the sun is in Gemini