WordReference Random House Unabridged Dictionary of American English © 2019
in•tro•gres•sion  (in′trə greshən),USA pronunciation n. [Genetics.]
    the introduction of genes from one species into the gene pool of another species, occurring when matings between the two produce fertile hybrids. Also called  in•tro•gressive hybridization  (in′trə greshən),USA pronunciation 
    • Latin intrōgress(us), past participle of intrōgredī to go in, enter (intrō- intro- + -gred-, combining form of grad(ī) to proceed, walk + -tus past participle suffix, with -dt- -ss-) + -ion
    • 1930–35 (earlier in literal sense of Latin)

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