imminution

plural imminutions

1. countableobsoleteuncountablereduction; lessening; decrease.

   No ſhade of change, no imminution, / No nor increaſe

   1647, Henry More, “Psychozoia, or The First Part of the Song of the Soul, Containing a Christiano-Platonicall Display of Life. Cant[o] I.”, in Philosophicall Poems, Cambridge, Cambridgeshire: […] Roger Daniel, printer to the University, →OCLC, page 3

   2 more examples

   and did not a Providence continually overſee and ſecure them from all alteration or imminution

   1691, John Ray, The Wisdom of God Manifested in the Works of the Creation. […], London: […] Samuel Smith, […], →OCLC, page 52

   Is it charged with Folly and Ignorance, to talk of a gradual declenſion or Imminution of a Form of Government, of e.g. Monarchy.

   1746, Arthur Ashley Sykes, A defence of the Examination of Mr. Warburton's Account of the theocracy of the Jews being, an answer to his remarks, so far as they concern Dr. Sykes, London: Printed for J. and P. Knapton, page 28