Adjustment to extant conditions: as, adjustment of a sense organ to the intensity or quality of stimulation; modification of some thing or its parts that makes it more fit for existence under the conditions of its current environment
An adaptation of a book or play is a film or a television programme that is based on it. Branagh's screen adaptation of Shakespeare's Henry the Fifth
(physiology) the responsive adjustment of a sense organ (as the eye) to varying conditions (as of light) a written work (as a novel) that has been recast in a new form; "the play is an adaptation of a short novel"
Adaptation is the act of changing something or changing your behaviour to make it suitable for a new purpose or situation. Most living creatures are capable of adaptation when compelled to do so. In biology, the process by which an animal or plant becomes fitted to its environment. It is the result of natural selection acting on inherited variation. Even simple organisms must be adapted in many ways, including structure, physiology, and genetics; movement or dispersal; means of defense and attack; and reproduction and development. To be useful, adaptations must often occur simultaneously in different parts of the body