potency

po·ten·cy

noun \ˈpōt-^ən-sē\

plural po·ten·cies

Definition of POTENCY

: the quality or state of being potent: as a : chemical or medicinal strength or efficacy <a drug's potency> b : the ability to copulate—usually used of the male c : initial inherent capacity for development of a particular kind <cells with a potency for eye formation>