preposition
- on top of; on the surface of
- immediately after; as soon as
- concerning; about; regarding
Usage: formal
Examples
- The book was placed upon the table.
- Upon hearing the news, she started crying.
- Once upon a time, there lived a princess.
- The deadline is upon us.
- He reflected upon his mistakes.
- The village sits upon a hill.
- Upon arrival, please check in at the front desk.