Upon ( preposition , adverb )

(As a preposition)

Upon ( preposition )

1. On the top of; on top of; on; over.
2. To or in the presence of; in the midst of.

Origin:

From old english upon, uppan, uppon, from up "up" + on "on".

Examples:

1. The book is upon the table.
2. The snow was upon the ground.
3. Upon my arrival, I was greeted by my host.
4. He climbed the stairs and upon reaching the top he saw the view.
5. Upon further consideration, I have decided to decline the offer.

(As an adverb)

Upon ( adverb )

1. On the top of; on top of; on; over.
2. To or in the presence of; in the midst of.

Origin:

From old english upon, uppan, uppon, from up "up" + on "on".

Examples:

1. The book is upon the table.
2. The snow was upon the ground.
3. Upon my arrival, I was greeted by my host.
4. He climbed the stairs and upon reaching the top he saw the view.
5. Upon further consideration, I have decided to decline the offer.