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1. Of or relating to characteristics of two or more species that have evolved through mutually beneficial interactions between the species.
2. Of or relating to alleles at two or more genetic loci that have become established because they are beneficial in combination with each other, but not with other alleles.
co′ad·ap·ta′tion (-ăd-ăp-tā′shən) n.
adapted to one another
co•a•dapt•ed(ˌkoʊ əˈdæp tɪd)
having undergone coadaptation; mutually accommodating.