self-defence BrE
self-defense AmE

And what else would it be other than self defense?

We have killed none of your men except in self defense.

We therefore believe that all black people should arm themselves for self defense.

He can be said to have fought in self defense.

The second half of each class is devoted to self defense.

He shoots the dog through the head in self defense.

"He will not fire his rifle except in self defense."

"People do have a right of self defense," I pointed out.

Special purpose models are intended for self defense, police, or military use.

He didn't know anything about the art of self defense.