Definition of Sagittarius
1
: a southern zodiacal constellation pictured as a centaur shooting an arrow and containing the point in the sky where the center of the Milky Way galaxy is located
2a
: the ninth sign of the zodiac in astrology — see Signs of the Zodiac Table
b
: one born under the sign of Sagittarius
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Merriam-Webster unabridged
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Time Traveler for Sagittarius
The first known use of Sagittarius was in the 14th century
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