Etymology
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inbreeding (n.)

"breeding of animals from the same parentage," c. 1842, from in + verbal noun from breed (v.). The older term for "to breed from animals of the same parentage" was to breed in and in (1765). The verb inbreed is attested from 1590s in the sense "produce within" (intransitive).

updated on November 03, 2015

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Definitions of inbreeding from WordNet

inbreeding (n.)
the act of mating closely related individuals;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.