Adaptation, an anatomical structure, physiological process or behavioral trait that has evolved.

Film adaptation, whose theme, story, or structure is based on another (usually literary) work.

Literary adaptation, wherein the central elements of a film or other visual medium are adapted into a novel, novella, or comic book.

Cellular adaptation, the changes made by a cell in response to changes in its environment.

Neural adaptation, the ability of neural systems to change their response behaviour depending on the recent stimulus history.

Adaptation (eye), ability of the eye to adjust to various levels of darkness and light.

Adapted process, a type of stochastic process.

Adapting to change (e.g. adaptation to global warming), contrast with mitigation.

Adaptation., 2002 film starring Nicolas Cage and Meryl Streep, directed by Spike Jonze