Webster’s Revised Unabridged Dictionary · 1913
Extempore
Ex·tem′po·re (·rē), adv. [L. ex out + tempus, temporis, time. See Temporal.] Without previous study or meditation; without preparation; on the spur of the moment; suddenly; extemporaneously; as, to write or speak extempore. Shak. — a. Done or performed extempore. "Extempore dissertation." Addison. "Extempore poetry." Dryden. — n. Speaking or writing done extempore. [Obs.] Bp. Fell.