endogenesisBiol.|ɛndəʊˈdʒɛnɪsɪs| [mod.L., f.Gr. ἔνδον endo- + γένεσις origin, production.] The production of structures or bodies within the organism. 1882Syd. Soc.Lex., Endogenesis, the development of one or more cells in the interior of a parent cell.