properly interrogitive what ? (including {how ?} why ? and when ?); but also exclamations like what ! (including {how !}) or indefinitely what (including {whatever} and even relatively that which); often used with prefixes in various adverbial or conjugational sneses

interr pron

1. what, how, of what kind

a. (interrogative)

1. what?

2. of what kind

3. what? (rhetorical)

4. whatsoever, whatever, what

b. (adverb)

1. how, how now

2. why

3. how! (exclamation)

c. (with prep)

1. wherein?, whereby?, wherewith?, by what means?

2. because of what?

3. the like of what? 1c

d. how much?, how many?, how often? 1c

e. for how long?

1. for what reason?, why?, to what purpose?

2. until when?, how long?, upon what?, wherefore? indef pron

2. anything, aught, what may