upon

1. 1.A higher-register or more formal alternative to on in most, though not all, prepositional uses.

   • But as they were upon going forth, a trumpet was sounded without, three strident blasts.
   • Little disappointed, then, she turned attention to "Chat of the Social World," gossip which exercised potent fascination upon the girl's intelligence.
   • Although the Celebrity was almost impervious to sarcasm, he was now beginning to exhibit visible signs of uneasiness, the consciousness dawning upon him that his eccentricity was not receiving the ovation it merited.

Overall

Common· #682

By learning goal

Everyday conversation

Rare

General reading & writing

Common

Academic

Uncommon

Literature

Rare