The Collaborative International Dictionary
Subsidency
Subsidence \Sub*sid"ence\, Subsidency \Sub*sid"en*cy\, n. [L. subsidens, -entis, p. pr. of subsidere. See Subside.] The act or process of subsiding.
The subdual or subsidence of the more violent passions.
--Bp.
Warburton.
Wiktionary
subsidency
n. (archaic form of subsidence English)