cardinal sign
noun Astrology.
any of the four astrological signs, Aries, Cancer, Libra, or Capricorn, that begin at the equinoxes and solstices, thus marking the beginning of the seasons: characterized by the attribute of strong initiative.
Compare quadruplicity.
Origin of cardinal sign
Middle English word dating back to 1350–1400
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019