• WordNet 3.6
    • v extemporise perform without preparation "he extemporized a speech at the wedding"
    • ***
Chambers's Twentieth Century Dictionary
    • v.i Extemporise to speak extempore or without previous preparation: to discourse without notes: to speak off-hand
    • ***


Chambers's Twentieth Century Dictionary
L. ex, out of, tempus, temporis, time.


In literature:

Looking in at a window we saw Tip Taylor, his back toward us, extemporising a speech.
"Eben Holden" by Irving Bacheller
For a while she busied herself round the extemporised bedside of her father.
"The Jewel of Seven Stars" by Bram Stoker
What various advantages would or might have resulted from a prolongation of such an extemporisation?
"Ulysses" by James Joyce
The staple dish of the extemporised meal was a pheasant.
"Sparrows" by Horace W. C. Newte
One night, as he extemporised as only he could, he sang a song of love to her.
"The Love Affairs of Great Musicians, Volume 1" by Rupert Hughes
Small boys went about making night hideous with tom-toms, extemporised out of empty fig-drums, and tooting terribly upon tin trumpets.
"Ireland Under Coercion (2nd ed.) (1 of 2) (1888)" by William Henry Hurlbert
We were not there that August morning to see an extemporised performance.
"T. De Witt Talmage" by T. De Witt Talmage
A double tube would be better, but that cannot be extemporised so easily.
"Alfred Russel Wallace: Letters and Reminiscences, Vol. 1 (of 2)" by James Marchant
The small jelly-speck, which we call the amoeba, has no organs save what it can extemporise as occasion arises.
"Selections from Previous Worksand Remarks on Romanes' Mental Evolution in Animals" by Samuel Butler
More than this, in one corner still lay some of the wraps which he had evidently used to extemporise a bed.
"The Cock-House at Fellsgarth" by Talbot Baines Reed

In poetry:

"We niggers," said they, "have formed a plan
By which, whenever we like, we can
Extemporise kingdoms near the beach,
And then we'll collar a kingdom each.
"The Three Kings of Chickeraboo" by William Schwenck Gilbert

In science:

The mechanic extemporised a make-do wing from a helicopter rotor, which was fitted to Clark’s car, and swiftly removed, but not before a Ferrari engineer had taken photographs of it.
Explanation and discovery in aerodynamics