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].
David Klinghoffer—a non-scientist—wrote the article but it consists entirely of an excerpt from the book Discovering Intelligent Design. Here's how the IDiots define evolution for their followers.
When terms are not carefully defined, miscommunication and false leaps of logic can result. For instance, when you see the word "evolution," you should ask, "Which definition is being used?" Typically, there are three common meanings."Definition" #1 might be close to a real scientific definition as long as they specify "heritable change." I doubt they do this.
>> Evolution #1: Microevolution (defined earlier): Small-scale changes in a population of organisms.
Macroevolution (also defined earlier) can be divided into two parts.
>> Evolution #2: Universal Common Descent: The view that all organisms are related and are descended from a single common ancestor.
>> Evolution #3: Natural Selection: The view that an unguided process of natural selection acting upon random mutation has been the primary mechanism driving the evolution of life.
Sometimes evolutionists purposefully confuse these definitions, hoping you won't notice that they overstated their case. It's not uncommon for an evolutionist to take evidence for microevolution (evolution #1), and claim it supports common descent (evolution #2) or development solely through unguided mechanisms (evolution #3).
"Definition" #2 is actually a conclusion based on observation. It's not a definition.
"Definition" #3 is what we normally refer to as "Darwinism" and it's one of the misconceptions about evolution that most textbooks try to dispel. It's not an acceptable definition in any textbook on my shelf.
So, there you have it. That's the best attempt by IDiots to explain the concept that they oppose.