tri·plic·i·ty 
(trĭ-plĭsĭ-tē, trī-)
(trĭ-plĭsĭ-tē, trī-)n. pl. tri·plic·i·ties
1. The quality or condition of being triple.
2. A group or set of three.
3. In astrology, one of four groups of the zodiac, each consisting of three signs separated from each other by 120°. Also called trigon.
[Middle English, three signs of the zodiac, from Late Latin triplicitās, triplicity, from Latin triplex, triplic-, triplex; see TRIPLEX.]