What is another word for extemporisation?
Pronunciation: [ɛkstˌɛmpɔːɹa͡ɪzˈe͡ɪʃən] (IPA) 
Extemporisation is a term that refers to the improvisation or the act of speaking or performing without preparation. A few possible synonyms for this term include impromptu, off-the-cuff, spontaneous, unscripted, ad-lib, extemporaneous, and unrehearsed. These terms all describe the ability to think on one's feet and react in the moment, without the aid of pre-written material. Some other related terms might include improvisation, spontaneous expression, and on-the-spot creativity. These synonyms are useful for describing a wide range of situations, from public speaking to musical performances, and they can help to capture the essence of the unique and unpredictable nature of extemporisation.
