We do not currently know of any synonyms for simultaneous death.
The noun simultaneous death is defined as:
In the law of wills, the death of two persons, each of whom would inherit the estate of the other if deemed to have survived the other, where such deaths occur within a time period set by statute (typically 120 hours), because of which the law treats each person as if they had died before the other in determining the distribution of estates.
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