* Darwin did not use the word "evolution" in the way we understand it today. In his book "On the Origin of Species," he used the term "descent with modification." This phrase emphasizes the idea that species change over time and descend from common ancestors.

* The word "evolution" was in use during Darwin's time. However, it was often used to describe development or unfolding, not biological change.

* Darwin's work was instrumental in popularizing the term "evolution" as we understand it today. His ideas about natural selection and common descent were widely influential, and the word "evolution" gradually took on its modern meaning of biological change over time.

So, while Darwin didn't use the word "evolution" in the same way we do today, his work was fundamental to its modern usage.