noun

• 1The state of being fourfold or of forming a set of four.

  1. 1.1Astrology A group of four zodiacal signs of the same quality.
     ‘Each four-sign group is called a quadruplicity.’
     More example sentences

     • ‘Now let's take a look at each sign and quadruplicity one by one, starting with the fire signs for a basic look at yourself, your friends and your colleagues.’