whereupon

conjunction

where·​up·​on ˈ(h)wer-ə-ˌpȯn 

-ˌpän

1

: on which

2

: closely following and in consequence of which

Word History

First Known Use

14th century, in the meaning defined at sense 1

Kids Definition

whereupon

conjunction

where·​up·​on ˈhwer-ə-ˌpȯn 

ˈhwar-,

ˈwer-,

ˈwar-,

-ˌpän

1

: on which

2

: and then : at which time