Libra

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A constellation in the Southern Hemisphere near Scorpius and Virgo. Also called Balance, Scales.
2. n. The seventh sign of the zodiac in astrology. Also called Balance, Scales.
3. n. One who is born under this sign.

Century Dictionary and Cyclopedia

1. n. [capitalized] An ancient zodiacal constellation, representing an ordinary pair of scales. This constellation was not commonly used among the Greeks, its place being occupied by the Chelæ, or Scorpion's Claws. It is found, however, in all the Egyptian zodiacs, going back to 600 b. c.; but there is reason to believe that it is not as old as the rest of the zodiac (that is, 2,000 years or more b. c.). Its principal stars, Kiffa borealis and Kiffa australis, 2.7 and 3.0 magnitude respectively, are at the base of an isosceles triangle of which Antares forms the vertex.
2. n. [capitalized] The seventh sign of the zodiac, represented by the character #214, which shows the scale-beam.
3. n. An Italian or Spanish pound. The Roman pound was 327 grams or 5,046 grains troy, and the Italian light-weight pounds seem to be derived from it, their heavy weights having another origin, as is shown in the following table:
4. n. All these statements are taken from the work of the Russian Commission, and differ in some cases from Italian official figures. The Castilian libra was 7,101 grains; that of Portugal was 7,083.3 grains.
5. n. A money of account at Alicante in Spain; the peso, worth 10 reals.
6. n. A new gold coin of Peru, struck under a decree of January 10, 1898, and of the same standard and weight as the pound sterling.

Wiktionary

1. n. astronomy : A constellation of the zodiac, supposedly shaped like a set of scales.
2. n. astrology : The astrological sign for the scales, ruled by Venus and covering September 24 - October 23 (tropical astrology) or October 16 - November 16 (sidereal astrology).
3. n. Someone with a Libra star sign

GNU Webster's 1913

1. n. The Balance; the seventh sign in the zodiac, which the sun enters at the autumnal equinox in September, marked thus ♎ in almanacs, etc.
2. n. A southern constellation between Virgo and Scorpio.

WordNet 3.0

1. n. (astrology) a person who is born while the sun is in Libra
2. n. the seventh sign of the zodiac; the sun is in this sign from about September 23 to October 22
3. n. a small faint zodiacal constellation in the southern hemisphere; between Virgo and Scorpius