• (RP) IPA: /əˈpɒn/
• (GA) IPA: /əˈpɑn/, /əˈpɔn/

1. Physically above and in contact with.

   Place the book upon the table.

2. Physically directly supported by.

   The crew set sail upon the sea.

   She balanced upon one foot.

3. Being followed by another so as to form a series.

   hours upon hours, years upon years, mile upon mile of desert

   • 1596-97, William Shakespeare, The Merchant of Venice, Act III Scene 1

     No news of them? Why, so: and I know not what's spend in the search: why thou loss upon loss! the thief gone with so much, and so much to find the thief; and no satisfaction, no revenge: nor no ill luck stirring but what lights on my shoulders; no sighs but of my breathing; no tears but of my shedding.

4. At (a prescribed point in time).

   The contract was rendered void upon his death.

5. on#Preposition|On.
   • 1914, Louis Joseph Vance, chapter I, in Nobody, New York, N.Y.: George H[enry] Doran Company, published 1915, OCLC 40817384 ↗:

     Little disappointed, then, she turned attention to "Chat of the Social World," gossip which exercised potent fascination upon the girl's intelligence.

• (all senses) on
• (time) at

• French: sur
• German: auf
• Portuguese: sobre, em
• Russian: на
• Spanish: sobre

• French: sur
• German: auf
• Portuguese: sobre, em
• Russian: на
• Spanish: sobre, en

• French: à
• German: mit
• Russian: по́сле
• Spanish: tras

upon (not comparable)

1. Being the target of an action.

   He was set upon by the agitated dogs