Most textbooks use some version of the following for the minimal DEFINITION of evolution [see What IS Evolution?].
Evolution is a process that results in heritable changes in a population spread over many generations.Now, we all know that Intelligent Design Creationists are keen on real science. They certainly don't want to mislead their flock. Let's see how they define evolution in the latest book they are promoting [From Discovering Intelligent Design: Define Your Terms].