Dictionary definition · Twin
noun
- (astrology) a person who is born while the sun is in Gemini
- either of two offspring born at the same time from the same pregnancy
- a waterfall in the Snake River in southern Idaho
- a duplicate copy
verb
- duplicate or match"The polished surface twinned his face and chest in reverse"
- bring two objects, ideas, or people together"This fact is coupled to the other one"
- grow as twins"twin crystals"
- give birth to twins
adjective
- being two identical
Source: Open English WordNet (CC BY 4.0).