also westernise, 1837, originally in reference to the U.S. West, from western + -ize.
Emigrants from Europe have brought the peculiarities of the nations and countries from whence they have originated, but are fast losing their national manners and feelings, and, to use a provincial term, will soon become "westernized." [J.M. Peck, "A New Guide for Emigrants to the West," Boston, 1837]
In reference to Europeanizing of Middle Eastern or Asian places and persons, from 1867. Related: Westernized; westernizing.