Libra Syllabification: (Li·bra)Pronunciation: /ˈlēbrə, ˈlī-/Translate Libra | into French | into German | into Italian | into Spanish Definition of Libra 1 Astronomy a small constellation (the Scales or Balance), said to represent the balance that is the symbol of justice. It contains no bright stars. (as genitive Librae /ˈlēbrē, ˈlī-/) used with a preceding letter or numeral to designate a star in this constellation:the star Alpha Librae 2 Astrology the seventh sign of the zodiac, which the sun enters at the northern autumnal equinox (about September 23). (a Libra) a person born when the sun is in the sign of Libra. Derivatives Libran noun & adjective sense 2.Origin:LatinLibra in other Oxford dictionaries Definition of Libra in the British & World English dictionary