ca·pa·bil·i·ty / ˌkāpəˈbilitē/ • n. (pl. -ties) (often capability of doing (or to do) something) power or ability: the capability to increase productivity. ∎ (often capabilities) the extent of someone's or something's ability: the job is beyond my capabilities. ∎ a facility on a computer for performing a specified task: a graphics capability. ∎ forces or resources giving a country or state the ability to undertake a particular kind of military action: nuclear capability.