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Meaning of air sign

air' sign"

Pronunciation: [key]
— Astrol. Astrol.
  1. any of the three astrological signs, Gemini, Libra, or Aquarius, that are grouped together because of the shared attributes of intellect and gregariousness. Cf. triplicity.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.