Source : Webster's Revised Unabridged Dictionary (1913)

Triplicity \Tri*plic"i*ty\, n. [Cf. F. triplicit['e], fr. L.
   triplex, triplicis, threefold. See {Triplicate}, a.]
   The quality or state of being triple, or threefold;
   trebleness.

         In their trinal triplicities on high.    --Spenser.

Source : WordNet®

triplicity
     n 1: (astrology) one of four groups of the zodiac where each
          group consists of three signs separated from each other
          by 120 degrees [syn: {trigon}]
     2: the property of being triple