From Longman Dictionary of Contemporary EnglishGeminiGem‧i‧ni /ˈdʒemənaɪ $ -ni/ noun 1 [uncountable]ROA the third sign of the zodiac, represented by twins, which some people believe affects the character and life of people born between May 22 and June 212 [countable]ROA someone who was born between May 22 and June 21
Examples from the Corpus
Gemini• Bob's a Gemini.• An astrologer suggested that these represented Leo and Gemini.Origin Gemini (1300-1400) Latin “twins” (Castor and Pollux, sons of the god Zeus) 