upon
upon definition
upon (ə pän′, ə pôn′)
on (in various senses), or up and on: on and upon are generally interchangeable, the choice being governed by idiom, sentence rhythm, etc.
Etymology: ME < up, up + on, on, prob. infl. by ON upp á (< upp, upward + á, on)
adverb
- on: used only for completing a verb a canvas not painted upon
- Obsolete on it; on one's person
- Obsolete thereupon; thereafter
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