{ Bi`o*gen"e*sis (&?;), Bi*og"e*ny (&?;), } n. [Gr. &?; life + &?;, &?;, birth.] (Biol.) (a) A doctrine that the genesis or production of living organisms can take place only through the agency of living germs or parents; -- opposed to abiogenesis. (b) Life development generally.