Definition

In astrology, the 12 zodiacal constellations (Aries through Pisces) that correspond to different personality archetypes based on birth dates. Each sign is believed to influence personality traits, behavior, and compatibility.

Example Usage

We're totally incompatible—I'm a Capricorn and she's a Gemini, and our signs just don't mesh well.

Origin

From the Babylonian zodiac, adopted into Western astrology via Hellenistic Greece; the term 'sign' has been used in this context since at least the 15th century.

Fun Fact

There are actually 13 constellations in the ecliptic path, but Western astrology uses only 12 to maintain symmetry.

Source: Definition backfill (hailey)