adverb

1. in what manner or way; by what means
2. in what state or condition
3. for what reason or purpose; why how is it that you don't know?
4. by what name
5. with what meaning; to what effect
6. to what extent, degree, amount, etc.
7. at what price
8. ☆ Informal what: usually a request to repeat something said

Etymology: ME hwu, hu < OE, akin to OHG hweo (Ger wie), Goth hwai-wa < IE interrogative base *kwo-, *kwe- > why, who, L quo, Sans kā

conjunction

1. the manner or way in which show us how you did it
2. the state or condition in which ask him how he's been
3. the extent, degree, amount, etc. to which do you know how I despise you?
4. in whatever manner or way judge him how you will
5. Informal that he told us how he was happy about it

noun

interjection