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Noun, pl. adaptations

1. A trait with a current functional role in the life history of an organism that is maintained and evolved by means of natural selection. An adaptation refers to both the current state of being adapted and to the dynamic evolutionary process that leads to the adaptation. (

2. (Ecology)
The adjustment or changes in behavior, physiology, and structure of an organism to become more suited to an environment. (

3. (Ophthalmology)
The ability of the eye to adjust to various light intensities by regulating the pupil of the quantity of light entering the eye. (

4. (Neurology)
The decline in the frequency of firing of a neuron, particularly of a receptor, to changed, constantly applied environmental conditions. (

5. (Dentistry)
a. The proper fitting of a denture.
b. The degree of proximity and interlocking of restorative material to a tooth preparation.
c. The exact adjustment of bands to teeth. (

Word origin: From French adaptation, from Medieval Latin adaptatio, from Latin adaptare

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