American Heritage Dictionary
(5)
Century Dictionary
(3)
GNU Webster's 1913
(1)
WordNet
(1)
Elsewhere on the web
"He's at his best when he's extemporaneous," said longtime lobbyist Bob Bishop.— Top Stories - Google News
(Harvard had long had an excellent team that competed in so-called on-topic debate but did not have a team that engaged in the extemporaneous parliamentary style of debating.)— Dorf on Law
He's had to assemble and present his thoughts about various topics during national extemporaneous speaking events at recent speech meets.— Craig Daily Press stories
While Plain is under pressure to present herself as a lucid and agile performer, Biden, too, must avoid the kind of extemporaneous remarks that have landed him in trouble before.— Home
While Palin is under pressure to present herself as a lucid and agile performer, Biden, too, must avoid the kind of extemporaneous remarks that have landed him in trouble before.— Omaha World-Herald > Frontpage

American Heritage Dictionary (1)
Century Dictionary (1)
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You can expect to see this word a few times a year.
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