Aries (Noun) — A small zodiacal constellation in the northern hemisphere; between Pisces and Taurus.
Aries (Noun) — (astrology) a person who is born while the sun is in Aries.
Aries (Noun) — The first sign of the zodiac which the sun enters at the vernal equinox; the sun is in this sign from about March 21 to April 19.