1.
the quality of being able to perform; a quality that permits or facilitates achievement or accomplishment
2.
possession of the qualities (especially mental qualities) required to do something or get something done
The following are synonyms for 'ability'. Click on any of them to get both Bibliodata's full list of common definitions and a further set of synonyms.
Prosopagnosia refers to the inability to identify people by their faces. In severe cased prosopagnosia a person may not be able to identify themselves in a mirror.