Simultaneous means happening at exactly the same moment. Simultaneous translation, simultaneous equations, simultaneously.
Simultaneous interpretation is done as the speaker talks rather than in the gaps, and it is exhausting enough that interpreters work in pairs and swap every half hour. In relativity, whether two events are simultaneous depends on who is looking.
1adjectivesimultaneousHappening at exactly the same moment.
“The film will have a simultaneous release in cinemas and online.”
simultaneous is a quality of timing.
Medieval Latin simultaneus comes from Latin simul, at the same time. Similar is a relative.
Proto-Indo-European
*sem-
Latin
simul — together, at the same time
Medieval Latin
simultaneus
English, today
simultaneous
Built from
From Medieval Latin simultaneus, from simultim (“at the same time, extended”), from Latin simul (“together, at the same time”); compare similar.
Etymology from Wiktionary, CC BY-SA