Wiktionary
a. 1 (misspelling of improvised English) 2 (alternative spelling of improvised English) (The spelling improvized is much rarer than improvised.)
Usage examples of "improvized".
Before long, however, a stiffish breeze sprang up, blowing directly in the direction we wanted, so we improvized a sail with a blanket and the pole, which took us along merrily.
He was engaged, at the time, in planning the destruction by siege of one of the circle of improvized but effective fortresses King Stephen had thrown up to contain and compress the depredations of Geoffrey’s host of outlaws, rebels and predators in the Fen country.
He asked Wallis for the muster-roll of the prisoners of war, and while it was being fetched he stood by an improvized hood over the cabin skylight with Jack Aubrey and said, 'I know I have seen that face before.