how

1. how (adv) — sense 1

Definition: To what degree or extent.

Example: How often do you practice?

2. how (adv) — sense 2

Definition: In what manner

Example: Economics is a messy discipline: too fluid to be a science, too rigorous to be an art. Perhaps it is fitting that economists’ most-used metric, gross domestic product (GDP), is a tangle too.[…]But as a foundation for analysis it is highly subjective: it rests on difficult decisions about what counts as a territory, what counts as output and how to value it. Indeed, economists are still tweaking it.

3. how (adv) — sense 3

Definition: In what manner:: By what means.

Example: How do you solve this puzzle? –Sorry, I can't remember how.

4. how (conj) — sense 4

Definition: Used to state that something is in a certain way or state.

Example: She told me how her father was a doctor.

5. how (intj) — sense 5

Definition: What?, pardon?

6. how (noun) — sense 6

Definition: The means by which something is accomplished.

Example: I am not interested in the why, but in the how.