"Extended" Natural Recordings by Native Speakers
Extended refers to something that has been prolonged or lengthened beyond its original bounds or limit. It can also describe something that has been expanded or widened in scope, degree, or size.
To extemporize means to think and express oneself spontaneously, often without prior preparation or planning. It involves speaking or composing without prior thought or planning, using one's natural talent and instinct to shape the words. This can be seen in improvisational acting, a free-form jazz performance, or an unscripted speech. The term also implies a degree of creativity and the ability to adapt to new situations, as the words or actions are not strictly planned or rehearsed.