Adaptation is the process of being adapting or being adapted.
Another meaning of this is: change or the process of change by which organisms or species becomes better suited to the environment.
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In biology, adaptation has three related meanings. Firstly, it is the dynamic evolutionary process that fits organisms to their environment, enhancing their evolutionary fitness. Secondly, it is a state reached by the population during that process.
the action or process of adapting or being adapted.