1. to speak or perform without preparation; to improvise
Usage: British spelling

Examples

• The speaker had to extemporise when his notes were lost.
• She was able to extemporise a brilliant response to the unexpected question.
• The jazz musician loved to extemporise during his solos.
• When the teleprompter failed, the news anchor had to extemporise.
• The teacher asked students to extemporise a short speech on any topic.
• He could extemporise witty remarks at any social gathering.