a zodiacal constellation in the northern hemisphere between Taurus and Cancer on the ecliptic
"Astronomers know that Gemini is a zodiacal constellation located in the northern hemisphere between Taurus and Cancer."
the third sign of the zodiac; the sun is in this sign from about May 21 to June 20
"As a Gemini, she was born under the sign where the sun resides between late May and mid-June."
Someone with a Gemini star sign
"As a typical Gemini, she loves to keep her friends entertained with witty stories and sudden changes of topic."
In plain English: A gemini is someone who has two personalities that sometimes act differently from each other.
"The Gemini twins looked exactly alike and always dressed in matching clothes."
A diminutive of the female given name Gemma.
"After her daughter Gemma reached adulthood, she affectionately called her granddaughter Gemini."
The word gemini comes from the Latin plural of geminus, meaning "twin." It was borrowed to describe the zodiac constellation originally identified in Sumerian mythology as the Divine Twins, Lugal-irra and Meslamta-ea.