Definition of "zodiac"

(astrology) The belt-like region of the celestial sphere approximately eight degrees north and south of the ecliptic which include the apparent path of the sun, moon, and visible planets.

(astrology) The twelve equal divisions of the zodiacal region into signs or houses, each named for a prominent constellation in the region.

(astronomy) The ecliptic: the belt-like region of the celestial sphere corresponding to the apparent path of the sun over the course of a year.  examples

Any of various astrological systems considered similar to the above.  quotations  examples

(countable) A circle decorated with the signs of the zodiac.  examples