LATIN DICTIONARYLexicon Latīnum
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“simultaneous” in Latin

The English word simultaneous itself goes back to Latin simul, through simultaneus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

simultaneous
ejusdem temporis: temporis ejus (of that time): eorum or eorundem temporum (of those times): qui (quae, quod) uno or uno et eodem tempore est or fit (that happens at the same time): aequalis alicui or alicujus (living at the same time).

Quick answer

What is the Latin word for simultaneous?
The usual Latin words for “simultaneous” are is, faciō, ūnus. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.