Gemini
Americanplural noun
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Geminis,
plural
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Geminorum
genitive
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Astronomy. the Twins, a zodiacal constellation between Taurus and Cancer containing the bright stars Castor and Pollux.
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Astrology.
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the third sign of the zodiac: the mutable air sign.
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a person born under this sign, usually between May 21st and June 20th.
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a two-person U.S. spacecraft designed for orbital rendezvous and docking: used in 1965–66 in various experiments preparatory to a landing on the moon.
noun
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astronomy a zodiacal constellation in the N hemisphere lying between Taurus and Cancer on the ecliptic and containing the stars Castor and Pollux
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classical myth another name for Castor and Pollux
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astronautics any of a series of manned US spacecraft launched between the Mercury and Apollo projects to improve orbital rendezvous and docking techniques
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astrology
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Also called: the Twins. the third sign of the zodiac, symbol ♊, having a mutable air classification and ruled by the planet Mercury. The sun is in this sign between about May 21 and June 20
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a person born when the sun is in this sign
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adjective
Usage
What does Gemini mean? Gemini is the name of a constellation that is interpreted as representing a pair of twins. It is sometimes referred to as the Twins. A constellation is a group of stars that appear near each other in the sky—especially a group that has been given a name. Gemini is considered one of the 12 zodiacal constellations—constellations that appear within a particular portion of the sky called the zodiac. In astronomy, the zodiac is the band of sky along which the paths of the sun, the moon, and the planets appear to move. Despite its basis in astronomy, the word zodiac is mainly associated with and most often used in the context of astrology, the nonscientific practice in which the positions of heavenly bodies at certain times are thought to influence or be correlated with human behavior and events. In astrology, zodiac refers to a diagram (often a circular one) representing the zodiac belt and showing the symbols associated with each of the 12 constellations or sections, which are called the signs of the zodiac. Gemini is one of these signs. It is situated between Taurus and Cancer and is considered the third sign of the zodiac. The other signs of the zodiac are Aries, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, and Pisces. The position of the sun in a particular portion of the zodiac at the moment of a person’s birth is thought to correlate with their personality. This is what people are referring to when they talk about their zodiac sign (or star sign or often just sign). People whose sign is Gemini are those born between May 21 and June 20. The word Gemini can be used as a noun to refer to someone who is born during this time, as in I was born in late May, so I’m a Gemini. The word Geminian can be used to mean the same thing. It can also be used as an adjective form of Gemini. The constellation is linked to the classical myth of the twins Castor and Pollux. The two brightest stars in Gemini are named after them. Gemini is also the name of a 1960s NASA program that involved multiple launches of a two-person spacecraft in preparation for the Apollo moon landings. Example: Even though I’m a Gemini, I don’t fit into the charismatic Gemini stereotype.
Other Word Forms
Noun Inflected Forms
Etymology
Origin of Gemini
1350–1400; Middle English < Latin geminī, plural of geminus
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
See Examples For:
Druckenmiller said he and his colleagues in his family office use all the major AI tools—Anthropic’s Claude, OpenAI’s ChatGPT, Google’s Gemini and Perplexity—for their work, including their writing.
From The Wall Street Journal ● Aug. 25, 2026
When Google first launched its Gemini AI tool, initially called Bard, it also did not allow children to use it.
From BBC ● Aug. 18, 2026
Gemini models have fallen a bit behind the cutting edge performance-wise in recent months; better and cheaper open-weight models threaten to pull customers away.
From The Wall Street Journal ● Aug. 16, 2026
The company’s newest Gemini 3 model swept industry benchmarks, beating out rivals OpenAI and Anthropic in performance after getting a late start to the large-language-model race.
From MarketWatch ● Aug. 15, 2026
Wrapped up like white mummies, we new astronauts were given our first peek at the Gemini spacecraft being built at the McDonnell plant in St. Louis.
From "Flying to the Moon: An Astronaut's Story" by Michael Collins
“It’s a talent Geminis have,” said Toni Holt Kramer, a Mar-a-Lago member and founder of the Trumpettes, a group of women who support the president, referring to Trump’s zodiac sign.
From The Wall Street Journal ● Jan. 2, 2026
Also, personality typing is highly meme-able, as Instagram accounts like Not All Geminis have demonstrated.
From Los Angeles Times ● Apr. 22, 2020
I’m still a bit cheeky when I talk about mixing my essential oils or send a Not All Geminis meme to a friend.
From Slate ● Dec. 23, 2019
As any astrology buff will tell you, both Libra and Gemini are air signs, and Geminis are stereotypically scarier than Libras.
From The Verge ● Jun. 26, 2019
When asked why he doesn’t believe in astrology, the logician Raymond Smullyan responds that he’s a Gemini, and Geminis never believe in astrology.
From "Innumeracy: Mathematical Illiteracy and Its Consequences" by John Allen Paulos
I observed to-night an occultation of a Geminorum; which, although at the bright limb of the moon, appears to give a very good result, that has been adopted for the longitude.
From The Exploring Expedition to the Rocky Mountains, Oregon and California To which is Added a Description of the Physical Geography of California, with Recent Notices of the Gold Region from the Latest and Most Authentic Sources by John Charles Frémont
Cas´-tor, α Geminorum, "the horseman of the twins."
From A Field Book of the Stars by William Tyler Olcott
For instance, the component stars forming β Aurigæ are about eight million miles apart, while in ζ Geminorum, the distance between the bodies is only a little more than a million miles.
From Astronomy of To-day A Popular Introduction in Non-Technical Language by Cecil Goodrich Julius Dolmage
On the 13th of March, 1781, between ten and eleven o'clock at night, Herschel was examining the small stars near H Geminorum with a seven-foot telescope, bearing a magnifying power of 227 times.
From Biographies of Distinguished Scientific Men by Robert Grant
Pol´-lux, β Geminorum, Ovid's "Pugil," the pugilist of the two brothers.
From A Field Book of the Stars by William Tyler Olcott
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
