upon in a sentence

prep.

Definition

Upon: preposition meaning at the time of or immediately after; used to indicate a condition or circumstance that follows an action.

Upon entering the room, she was immediately struck by the warmth of the sunlight streaming through the windows.
He promised to help her upon his return from the trip, ensuring she wouldn't feel overwhelmed.
The decision was made upon thorough consideration of all the available options.
Upon hearing the news, the entire team erupted in cheers of joy and celebration.
She found solace upon discovering a hidden talent for painting that she never knew she had.