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Spoken, done, or composed with little or no preparation or forethought: an extemporary lecture.
ex·tem′po·rar′i·ly (-râr′ə-lē) adv.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.