We had "How do you define the word Evolution?" but all it has done is show that it can be used many different ways and the thread has become a quagmire. Can we start again with a more restricted version, "How do you define the
Theory of Evolution?". Not just change over time, not just the process of evolution, the Theory of Evolution.
Jerry Coyne in "Why Evolution is True" managed to give a definition in one paragraph. So did Kerkut in "Implications of Evolution". Can you give a definition in one paragraph? Some people might need more but try to be as concise as possible.