v. i.
v. t. To do, make, or utter extempore or off-hand; to prepare in great haste, under urgent necessity, or with scanty or unsuitable materials;
Themistocles . . . was of all men the best able to extemporize the right thing to be done. Jowett (Thucyd. ). [ 1913 Webster ]
Pitt, of whom it was said that he could extemporize a Queen's speech Lord Campbell. [ 1913 Webster ]
n. One who extemporizes. [ 1913 Webster ]