Main Entry: si·mul·ta·neous

Pronunciation: \ˌsī-məl-ˈtā-nē-əs, -nyəs also ˌsi-\

Function: adjective

Etymology: Latin simul at the same time + English -taneous (as in instantaneous) — more at same

Date: circa 1660

1 : existing or occurring at the same time : exactly coincident
2 : satisfied by the same values of the variables <simultaneous equations>

synonyms see contemporary

— si·mul·ta·ne·i·ty \-tə-ˈnē-ə-tē, -ˈnā-\ noun

— si·mul·ta·neous·ly \-ˈtā-nē-əs-lē, -nyəs-\ adverb

— si·mul·ta·neous·ness noun