n. The act or process of adapting.n. The state of being adapted.n. Something, such as a device or mechanism, that is changed or changes so as to become suitable to a new or special application or situation.n. A composition that has been recast into a new form: The play is an adaptation of a short novel. n. Biology An alteration or adjustment in structure or habits, often hereditary, by which a species or individual improves its condition in relationship to its environment.n. Physiology The responsive adjustment of a sense organ, such as the eye, to varying conditions, such as light intensity.n. Change in behavior of a person or group in response to new or modified surroundings.