hah

1. A representation of laughter.

   Ha, ha, ha! That’s funny.

2. An exclamation of triumph or discovery.

   Ha! Checkmate!

3. An exclamation of grief.
4. A sound of hesitation: er, um.

interjection

Said when making a vigorous attack.

1. (with falling pitch) used to express amusement or subtle surprise.

   Huh! I'm sure I locked it when I left.

2. Used to express doubt or confusion.

   Huh? Where did they go?

3. (with rising pitch) Used to reinforce a question.

   Where were you last night? Huh?

4. (with falling pitch) Used either to belittle the issuer of a statement/question, or sarcastically to indicate utter agreement, and that the statement being responded to is an extreme understatement. The intonation is changed to distinguish between the two meanings - implied dullness for belittlement, and feigned surprise for utter agreement.

   (agreement) A: "Murder is bad." B: "Huh!"

5. (with rising pitch) Used to indicate that one did not hear what was said.

   Huh? Could you speak up?

6. (with falling pitch) Used to create a tag question.

   It's getting kind of late, huh?

noun

The fifth letter of many Semitic alphabets (Phoenician, Aramaic, Hebrew, Syriac, Arabic and others).