Wh-movement Definition

noun

(syntax) A syntactic phenomenon found in many languages around the world, in which interrogative words (sometimes called wh-words) or phrases show a special word order. Unlike ordinary phrases, such wh-words appear at the beginning of an interrogative clause.

Wiktionary

Origin of Wh-movement

Most English interrogative words start with wh-, for example, who, whom, whose, what, which, when, where, why, etc. (though how is an exception).

From Wiktionary