simultaneous and multiple; happening at the same time in different places
Describes events that occur concurrently in multiple locations. Often used in news contexts, e.g., 同時多発テロ (simultaneous terrorist attacks).
We need to prepare for simultaneous natural disasters.
Simultaneous cyberattacks were reported.
Compound of 同時 (simultaneous) + 多発 (multiple occurrences) + adjectival suffix 的.