noun

1. The process of adapting something or becoming adapted to a situation; adjustment, modification.

2. A change that is made or undergone to suit a condition or environment.

3. The process of change that an organism undergoes to be better suited to its environment.

4. An instance of an organism undergoing change, or the structure or behavior that is changed.

5. The process of adapting an artistic work from a different medium.

6. (authorship) An artistic work that has been adapted from a different medium.