Meaning

(biology, evolutionary theory) The use of a biological structure or function for a purpose other than that for which it initially evolved..

Definitions by Sense

1. (biology, evolutionary theory) The use of a biological structure or function for a purpose other than that for which it initially evolved.
2. (linguistics, by extension) The promotion of meaningless or redundant material so that it does new grammatical (morphosyntactic or phonological) or semantic work.

Example Sentences

Birds initially developed wings and feathers as a means of heat regulation. The use of wings for flight is an example of exaptation.

I believe that Stephen Gould and Elizabeth Vrba were correct in proposing exaptation as a missing term in evolutionary biology. I want to make a distinction between adaptation and exaptation here. Again it is about mechanistic differences. An exaptation can be viewed as the acquisition of a new and useful function once the novelty has spread and once the environment has changed.

These presumed exaptations can be assigned to major categories associated with theories of movement (Nathan et al. 2008). In table 1.2, we list five categories of exaptations that we believe make resident birds possessing them preadapted for migration.

An interesting consequence of this way of characterizing exaptations is that whether or not a trait counts as an exaptation depends upon how we describe it. Human legs are adaptations for locomotion, but exaptations for walking.

The process Haiman focuses on is exaptation, which he defines as "the promotion of meaningless or redundant material so that it does new grammatical (morphosyntactic or phonological) or semantic work" (p52).

Word Forms

• exaptations

Related Words

When Should You Use Exaptation?

Use exaptation when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.

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