Power, authority. / The ability or capacity to perform something / (usually of men) Sexual virility: the ability to become erect or achieve orgasm.

plural of potency

power or strength; potency / A stud that acts as a support of a pivot in a watch or clock / (heraldry) Synonym of crutch

plural of potence

(pyschology) The ability to experience full orgasmic gratification while engaging in the sexual act, a condition only possible for people without neuroses.