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Spoken, done, or composed with little or no preparation or forethought: an extemporary lecture.

[From extempore.]

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.
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Adv.1.extemporarily - without prior preparation; "he spoke extemporaneously"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
After solidification at 4[degrees]C, the cover slips were removed and slides were incubated for 1 h at 4[degrees]C in lysis solution (2.5 M NaCl, 100 mM EDTA, and 10 mM tris-HCl, pH 10), extemporarily added with 10% DMSO and 1% triton X-100.
According to respondents serving international timber markets, the domestic sector is discordant with written legislation and it will be difficult, if not impossible, to render such an extemporarily or non-regulated sector compatible with the VPA.
Due to their subtle appearance and symptomatology as a typical subcutaneous lump, Granular cell tumors are often extemporarily misdiagnosed with histological examination setting the correct diagnosis subsequently, which carries significant clinical importance for follow-up and further management of these rare tumors.