say it: sahy-muhl-TAY-nee-uh-slee
simultaneously is an adverb meaning "at the same instant". It is pronounced /ˌsaɪməlˈteɪniəsli/ — sahy-muhl-TAY-nee-uh-slee. It carries one recorded sense.
Definitions, synonyms and semantic relations for simultaneously 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.