potency

Short definition from Wiktionary

Noun

1. 1
   Power, authority.
2. 2
   The ability or capacity to perform something
3. 3
   The ability or capacity to perform something: Sexual virility: the ability to become erect or achieve orgasm.
4. 4
   Concentration; strength
5. 5
   Potentiality, ability, capacity.
6. 6
   Cardinality.