1. Identifying the agent performing an action: after a noun denoting an action.
2. Indicating the means of achieving something.
3. Indicating the amount or size of a margin.
4. Indicating a deadline or the end of a particular time period.
5. Indicating location of a physical object beside a place or object.
6. Indicating the period in which something happens.
7. Concerning; according to.
8. Used in mild oaths.
9. So as to go past.
Poonam was really surprised by his speech.