From under- + divergence. <span class="searchmatch">underdivergence</span> (uncountable) A lack of divergence. A minimum amount of divergence....
overdivergence (uncountable) A divergence to an excessive degree. Antonym: <span class="searchmatch">underdivergence</span> 2007, Christina Matta, The science of small things: the botanical context...
nondivergence normodivergence overdivergence point of divergence subdivergence <span class="searchmatch">underdivergence</span> diverge divergent the degree of divergence mathematical operator OED2...