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Definition of evolve for English Language Learners. : to change or develop slowly often into a better, more complex, or more advanced state : to develop by a process of evolution.
Adaptation is the evolutionary process whereby a population becomes better suited to its habitat. The word adaptation comes from the root word adapt and means to change in a way that is beneficial to survival. Most people and animals will adapt to new surroundings if forced to. It means changing something to fit the circumstance, or changing an action or response to better deal with something.