From ZooTerms (Dictionary of Invertebrate Zoology)
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neoteny also neoteinia, neoteiny (noun; Greek neos, young; teinein, to extend): 1. A term referring to the condition in which the gonad completes its development prematurely before the normal differentiation of imaginal structures are completed

See also: hysterotely. 2. (Arthropoda) Further classified into two categories: prothetely and metathetely