In classical music, a cadenza is a long and difficult solo passage in a piece for soloist and orchestra.
cadenza in British English
(kəˈdɛnzə)
noun
1.
a virtuoso solo passage occurring near the end of a piece of music, formerly improvised by the soloist but now usually specially composed
2. South Africa informal
a fit or convulsion
Word origin
C19: from Italian; see cadence
cadenza in American English
(kəˈdɛnzə)
noun
1.
an elaborate, often improvised musical passage played unaccompanied by the solo instrument in a concerto, usually near the end of the first or the final movement