core competency

Noun

 * 1)  An important special capability or expertise, especially that of a business affording it sustainable competitive advantage.
 * The publisher's core competency was paperbacks, but they decided to branch out into online publishing.

Translations

 * Dutch:
 * Finnish: ydinkompetenssi
 * Swahili: umilisi wa kimsingi
 * Swedish: kärnkompetens