On the condition or understanding; if; providing
On whatever occasion
On the assumption that; supposing:
Because event X may occur
Used in indirect questions to introduce one alternative:
Find another word for if. In this page you can discover 19 synonyms, antonyms, idiomatic expressions, and related words for if, like: granting, provided that, with the condition that, on condition that, provided, suppositive, on the assumption that, assuming that, whenever, supposing that and conceding that.