Merriam-Webster's Collegiate® Dictionary, 11th Edition
HOW
I. adverb see: who Date: before 12th century
1. in what manner or way, for what reason ; why , with what meaning ; to what effect, by what name or title, to what degree or extent, in what state or condition , at what price ,
II. conjunction Date: before 12th century
1. the way or manner in which , that , however , as ,
III. noun
Date: 1533
a question about manner or method, manner , method