Etymology
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simultaneous (adj.)

1650s, from Medieval Latin simultaneus, perhaps from simultim "at the same time," extended from Latin simul "at the same time," related to similis "like, resembling, of the same kind" (see similar), or from simul with ending abstracted from Late Latin spontaneus, where the -t- is organic. Related: Simultaneously.

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Definitions of simultaneous

simultaneous (adj.)
occurring or operating at the same time;
Synonyms: coincident / coincidental / coinciding / concurrent / co-occurrent / cooccurring
From wordnet.princeton.edu