The Collaborative International Dictionary
Incidency
Incidency \In"ci*den*cy\, n.
Incidence. [Obs.]
--Shak.
Wiktionary
incidency
n. 1 (context obsolete English) An incident; something incidental or circumstantial. 2 (context obsolete English) The quality or fact of being likely or about to fall. 3 (context obsolete physics English) incidence.