progenesis
/prə(ʊ)ˈdʒɛnɪsɪs/Biology
noun
Precocious sexual maturity in an organism still in a larval (or other immature) stage; (also) accelerated maturation of the sexual organs (as an evolutionary process) resulting in paedomorphosis.
Origin
1930s; earliest use found in Parasitology. From pro- + -genesis, after French progénèse.