Definition
"Extemporaneous" means spoken or done without preparation. It's like delivering a speech or performing a task on the spur of the moment. Unlike "ad-lib," which might imply a complete lack of structure, "extemporaneous" often suggests some prior knowledge or a basic outline. Think of it as speaking from notes rather than a fully written script. It is a bit more planned than ad-libbing but not fully rehearsed. It's the middle ground between total improvisation and rigid preparation.