upon

Fetched 2026-10-26 (cache).

Datamuse reports no synonyms or antonyms for this word.

Preposition

1. {{lb|en|higher register|or|formal}} {{n-g|alternative to '''''[[on]]''''' in most, though not all, prepositional uses.}}

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.