Meaning of the word "only if" in English

What does "only if" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

only if

US /ˈoʊnli ɪf/
UK /ˈəʊnli ɪf/

Conjunction

used to state a condition that must be met for something else to happen

Example:
You can go to the party only if you finish your homework.
I will help you only if you promise to do your best.