noun (n)

• (astrology) a person who is born while the sun is in Gemini(noun.person)

  Synonym:
  twin
  

  source: wordnet30
• a zodiacal constellation in the northern hemisphere between Taurus and Cancer on the ecliptic(noun.object)

  source: wordnet30
• the third sign of the zodiac; the sun is in this sign from about May 21 to June 20(noun.location)

  Synonym:
  gemini the twins, twins
  

  source: wordnet30
• A constellation of the zodiac, containing the two bright stars Castor and Pollux; also, the third sign of the zodiac, which the sun enters about May 20th.(noun)

  source: webster1913