[ 'ɒŋkɔ: ]
■ noun a repeated or additional performance of an item at the end of a concert, as called for by an audience.
■ exclamation again! (as called by an audience at the end of a concert).
■ verb call for (an ~).
↘(of a performer) give an ~.
Origin
C18: Fr., lit. 'still, again'.