imminution
reduction; lessening; decrease.
countable, obsolete, uncountable
No ſhade of change, no imminution, / No nor increaſe
Where it comes from
From Latin imminutio, from imminuere, imminutum (“to lessen”), from im- (“in”) + minuere.
Adapted from the Wiktionary entry imminution (CC BY-SA 4.0).