Definition of libra
1 capitalized a : a southern zodiacal constellation between Virgo and Scorpio represented by a pair of scales b (1) : the seventh sign of the zodiac in astrology — see zodiac table (2) : one born under the sign of Libra
2 a plural li·brae play \ˈlī-ˌbrē, ˈlē-ˌbrī\ [Latin] : an ancient Roman unit of weight equal to 327.45 grams b [Spanish & Portuguese, from Latin] : any of various Spanish, Portuguese, Colombian, or Venezuelan units of weight
Origin of libra
Middle English, from Latin (genitive Librae), literally, scales, pound
First Known Use: before 12th century
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