|1.||[ conjunction ] coordinating conjunction, at which time or place|
|2.||[ adverb ] upon which|
"the rock whereupon she stood"
|3.||[ adverb ] closely following and in consequence of which|
"the Japanese refused to import U.S. made cellular phones whereupon the U.S. imposed strict tariffs on Japanese exports"
|4.||[ adverb ] in consequence of which|
"this is a statement whereat the listeners may get angry"