Definition of triplicity in English:

triplicity

noun

rare
  • 1A group of three people or things.

    • ‘The triplicity of the Goddess in these texts is one of the most recurrent themes.’
    • ‘The triplicity of waters will give birth to a man who will choose Thursday as his holy day.’
    1. 1.1archaic The state of being triple.
      • ‘The primary meaning may be mystical, but paradoxical triplicity is very much in the spirit of the poem.’

Origin

Late Middle English (as a term in astrology): from late Latin triplicitas, from Latin triplex, triplic- threefold (see triplex).

Pronunciation:

triplicity

/triˈplisədē/