Толковый словарь английского языка Oxford English Reference - ability

suffix forming nouns of quality from, or corresponding to, adjectives in -able (capability; vulnerability). Etymology: F -abilit{eacute} or L -abilitas: cf. -ITY ABILITY n. (pl. -ies) 1 (often foll. by to + infin.) capacity or power (has the ability to write songs). 2 cleverness, talent; mental power (a person of great ability; has many abilities). Etymology: ME f. OF ablete f. L habilitas -tatis f. habilis able