Defiance means:
* Open resistance or bold disobedience. It's the act of refusing to obey or submit to someone or something.
* A bold challenge or confrontation. It can also refer to the act of standing up to someone or something, even if it's powerful or dangerous.
Here are some examples:
* "The protesters showed their defiance by marching on the government building."
* "The teenager's defiance was clear as she refused to do her chores."
* "The king's defiance of the treaty led to war."
Defiance can be a positive or negative trait, depending on the context. It can be a sign of courage and strength, but it can also be a sign of recklessness or stubbornness.