Exception
noun, の adjective
Something that's outside the example doesn't follow the rules. It's not what it's supposed to be (the example), it is the exception.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
例外が起きる
an exception occurs
例外がある
there are exceptions
例外が発生する
an exception occurs
このレストランの料理は例外なくどれもおいしいです。
All of the dishes at this restaurant are delicious without exception.
そのケースは例外中の例外だと思いますよ。
I think that case is an exception to the exceptions.
社長の気分が良ければ、例外的にOKをもらえることもあるそうです。
I've heard that if the president is in a good mood, sometimes he'll make exceptions and say it's okay.