Dictionary.net

Used adjectively, meaning how remarkable, or how great; as, what folly! what eloquence! what courage!

Sometimes prefixed to adjectives in an adverbial sense, as nearly equivalent to how; as, what happy boys!

As a relative pronoun

Used adverbially in a sense corresponding to the adjectival use; as, he picked what good fruit he saw.

Something; thing; stuff.

Why? For what purpose? On what account?

Used substantively with the antecedent suppressed, equivalent to that which, or those [persons] who, or those [things] which; - called a compound relative.

Used adjectively, equivalent to the . . . which; the sort or kind of . . . which; rarely, the . . . on, or at, which.

Whatever; whatsoever; what thing soever; - used indefinitely.

Used adverbially, in part; partly; somewhat; - with a following preposition, especially, with, and commonly with repetition.

Used adjectively, meaning how remarkable, or how great; as, what folly! what eloquence! what courage!

Sometimes prefixed to adjectives in an adverbial sense, as nearly equivalent to how; as, what happy boys!

As a relative pronoun

Used adverbially in a sense corresponding to the adjectival use; as, he picked what good fruit he saw.

Something; thing; stuff.

Why? For what purpose? On what account?

Used substantively with the antecedent suppressed, equivalent to that which, or those [persons] who, or those [things] which; - called a compound relative.

Used adjectively, equivalent to the . . . which; the sort or kind of . . . which; rarely, the . . . on, or at, which.

Whatever; whatsoever; what thing soever; - used indefinitely.

Used adverbially, in part; partly; somewhat; - with a following preposition, especially, with, and commonly with repetition.

Compound relative meaning that which; the thing that; as, have you found what you want? an interrogative; as, what are you doing? an indefinite; as, I do not know what happende.

Interrogative; as, what trade does he follow?.

How; how much; as, what does it profit? Partly: followed by with; as, what with the cold and what with the darkness we could go no farther.

That; as, there is no doubt but what he will succeed; so far as; as well as.

Neuter of WHO: how great: something. -rel. pron. -that which. -WHAT TIME (B.)-at what time, when.

That which:-also used in asking questions, as, what is it? What man?.

In interrogative construction, asking. For information as to a person or thing.

How surprising, ridiculous, great, or the like.

Which circumstance, event, relation, or the like.

That which; a double relative.

In what respect; to what extent.

In some measure; partly.

So far as; as well as.

That; especially in the phrase but what.

Sort of.

That which; the thing that; which part, much used in asking questions interrogatively and elliptically, as equivalent to what will be the consequence? What time, at the time when. What though, granted this or that; allow it to be so. What, ho! an exclamation of calling.

Thing; matter.

That which; the thing that; the sort or kind; which of several; used as an exclamatory word by way of surprise or question, meaning, how great, how remarkable, and suchlike; used for partly or in part,-as, "what with war, what with poverty".