I checked One Look Dictionaries, the Faster Finder, and here's the one and only entry given there (very fast):

SYLLABICATION: ex·ap·ta·tion
PRONUNCIATION: gzp-tshn I have no earthly idea...
NOUN: Biology The utilization of a structure or feature for a function other than that for which it was developed through natural selection.
ETYMOLOGY: ex– + (ad)aptation.
OTHER FORMS: ex·apted —ADJECTIVE
ex·aptive —ADJECTIVE


So, it's strictly biological, huh? But here we've gone and made exaptive linguistic use of it on this thread.

Also, notice in the above definition: no verb is included, at least by Bartleby.