Balance, one of the mechanical powers. See Balance.

Astronomy, one of the twelve signs of the zodiac, exactly opposite to Aries, and so called because when the sun is in this sign at the autumnal equinox, the days and nights are equal, as if weighed in a balance. The stars in this constellation are, according to Ptolemy 17, to Tycho 10, to Hevelius 20, and to Flamsteed 51.