Definition of how:

part of speech: adverb

In what manner; to what degree or extent; for what reason; in what state; used as an int. as " how are the mighty fallen!" used as a noun, as " the when, the how, and the wherefore".

Usage examples:

• That's how I see it. Alexander Irvine in "My Lady of the Chimney Corner".

• How did I come? Charles Weathers Bump in "The Mermaid of Druid Lake and Other Stories".

• How should he go to work to do it? Ralph Bonehill in "Leo the Circus Boy".