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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 from WordNet
Dictionary entries near simultaneous
simulated
simulation
simulator
simulcast
simultaneity
simultaneous
simurgh
sin
Sinai
since
sincere