Meaning of the word unless in English

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

unless

US /ənˈles/
UK /ənˈles/
"unless" picture

Conjunction

except when (used to introduce a case in which a statement is not true or valid)

Example:
You won't pass the exam unless you study harder.
I won't go out unless it stops raining.