Found in the following dictionaries
OTCWL2014 (NASPA Word List 2014)
"Exaptation" Definition
noun
Biology the utilization of a structure or feature for a function other than that for which it was developed through natural selection.
Source: American Heritage Dictionary
The use of a biological structure or function for a purpose other than that for which it initially evolved.
Source: Wiktionary
The process by which features acquire functions for which they were not originally adapted or selected.
Source: Oxford Dictionary
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