exaptation.
The use of a biological structure or function for a purpose other than that for which it initially evolved.
Meaning & usage
The use of a biological structure or function for a purpose other than that for which it initially evolved.
Birds initially developed wings and feathers as a means of heat regulation. The use of wings for flight is an example of exaptation.
The promotion of meaningless or redundant material so that it does new grammatical (morphosyntactic or phonological) or semantic work.
Where this word comes from
Etymology tree Proto-Indo-European *h₁éǵʰ Proto-Indo-European *-s Proto-Indo-European *h₁éǵʰs Proto-Italic *eks Latin ex Latin ex-der. Middle French ex-bor. Middle English ex- English ex- Proto-Indo-European *h₂éd Proto-Italic *ad Proto-Italic *ad- Latin ad- Proto-Indo-European *h₂ep- Proto-Indo-European *-tós Proto-Indo-European *h₂ptós Proto-Italic *aptos Latin aptus Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-yéti Proto-Indo-European *-eh₂yéti Proto-Indo-European *-h₂tiinflu. Proto-Italic *-ājō Proto-Italic *-āō Latin -ō Proto-Indo-European [Term?]der. Proto-Italic *apjō Latin apiō Proto-Indo-European *-tós Proto-Italic *-tos Latin -tus ▲ Latin -ō Latin -tō Latin aptō Latin adaptō Proto-Indo-European *-tis Proto-Indo-European *-Hō Proto-Indo-European *-tiHō Proto-Italic *-tiō Latin -tiō Medieval Latin adaptātiōbor. French adaptationbor. English adaptation blend English exaptation Blend of ex- + adaptation. Coined 1982 by palaeontologists Stephen Jay Gould and Elisabeth Vrba to avoid the perceived teleological baggage of the existing term preadaptation.
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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.
Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.