twin in WordNet English dictionary

1. a duplicate copy
   counterpart  similitude  twin 
   
2. either of two offspring born at the same time from the same pregnancy
   twin 
   

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

1. being two identical
   duplicate  matching  twin  twinned