To compose, create, or perform something without advance preparation or planning (British spelling).
Formed from 'extempore' or 'extemporary' plus the verb-forming suffix '-ise' (British), following Latin roots. The American version uses '-ize.'
British musicians and speakers often use 'extemporise,' while Americans say 'extemporize'—it's the same action, just spelled according to regional conventions.
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