say it: di-vel-uhp-MEN-uh-lee
developmentally is an adverb meaning "with respect to development". It carries one recorded sense.
with respect to development
“developmentally retarded”
Definitions, synonyms and semantic relations for developmentally come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.