Extemporize vs Pm - What's the difference?

As a verb extemporize

is to do something, particularly to perform or speak, without prior planning or thought; to act in an impromptu manner; to improvise.

* extemporise (mostly Commonwealth)

(extemporiz)

To do something, particularly to perform or speak, without prior planning or thought; to act in an impromptu manner; to improvise.

* 1881 , , Mary Marston , ch. 35:

"Will you please tell me whose music you have been playing?" . . .

"It's nobody's, miss."

"Do you mean you have been extemporizing all this time?"

* 2009 March 5, , " The (very) scripted president," New York Times (retrieved 8 Nov 2011):

But while some of his predecessors liked to extemporize , Obama prefers the message to be just so.

To do, create, improvise, adapt, or devise in an impromptu or spontaneous manner.

* 1860 , , The Marble Faun , ch. 10:

As the music came fresher on their ears, they danced to its cadence, extemporizing new steps and attitudes.

* 1879 , , Evolution, Old & New , ch. 5:

The small jelly-speck, which we call the amoeba, has no organs save what it can extemporize as occasion arises.

* 1906 , , The Dynasts , Part Second, Act Third:

The wine runs into pitchers, washing-basins, shards, chamber- vessels, and other extemporized receptacles.

* 2003 Aug. 25, Emily Eakin, " How King Shaped The Dream," New York Times (retrieved 8 Nov 2011):

His most famous words — "I have a dream" — were extemporized .

* (intransitive) improvise, think on one's feet * (transitive) devise, improvise

(head)

The ISO 3166-1 two-letter (alpha-2) code for Saint Pierre and Miquelon.