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(uncountable) The process of adapting something or becoming adapted to a situation; adjustment, modification.
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(countable) A change that is made or undergone to suit a condition or environment.
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(uncountable, evolutionary theory) The process of change that an organism undergoes to be better suited to its environment.
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(countable, evolutionary theory) An instance of an organism undergoing change, or the structure or behavior that is changed.
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(uncountable) The process of adapting an artistic work from a different medium.
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(countable, authorship) An artistic work that has been adapted from a different medium.
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(sociology) The means by which social groups adapt to different social and physical environments.