The Collaborative International Dictionary
Penetrancy
Penetrance \Pen"e*trance\, Penetrancy \Pen"e*tran*cy\, n. The quality or state of being penetrant; power of entering or piercing; penetrating power of quality; as, the penetrancy of subtile effluvia.
Wiktionary
penetrancy
n. The quality or state of being penetrant; penetrance.