perennity

perenn +‎ -ity, from Latin perennitas.

perennity (usually uncountable, plural perennities)

1. (archaic) The quality of being perennial.
   • 1713, W[illiam] Derham, Physico-Theology: Or, A Demonstration of the Being and Attributes of God, from His Works of Creation. […], London: […] W[illiam] Innys, […], →OCLC:

     the perennity of divers Springs, which always afford the same quantity of Water

   • 1972, John Bowman, editor, Comparative Religion: The Charles Strong Trust Lectures 1961-1970‎:

     But these phenomena remain a proof, albeit in reverse, of the perennity of the mystical quest.

• “perennity”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.