1. astrologically significant part of sky: a narrow band in the sky in which the movements of the major planets, Sun, and Moon take place, astrologically divided into twelve sections named for the major constellations
2. astrologer's chart: a chart linking twelve constellations to twelve divisions of the year, used as the astrologer's main tool for analyzing character and predicting the future
3. recurring set: a set of things or a sequence of events that repeats itself cyclically
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literary
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[14th century. Via French and Latin< Greek zōidiakos kuklos "circle of animal figures" < zōidion "small animal" < zōion (see -zoon)]
