ETYM Latin posthumus, postumus, properly, last; hence, late born (applied to children born after the father's death, or after he had made his will), superl. of posterus, posterior. Related to Posterior.
After person's death; born after father's death; published after author's death.
Occurring after a person's death; (in the case of a child) born after the father's death.
Postum, nachgeboren; nachgelassen (von den Werken eines Künstlers oder Wiss.); nach dem Tode verliehen (von Preisen).