1. done or spoken without preparation or planning; impromptu
Usage: formal or literary; less common than 'extemporaneous' or 'extempore'
2. existing or occurring outside of time; not bound by temporal limits
Usage: philosophical or theological; rare

Examples

• The speaker gave an extemporal address that impressed the audience despite having no notes.
• She delivered an extemporal performance of the piano piece from memory.
• His extemporal remarks were witty and engaging.
• The debate required extemporal thinking and quick responses.
• In philosophy, some argue that truth is extemporal and unchanging.