postmortem (Adjective) — Occurring or done after death. ex. "postmortem changes" ex. "a postmortem examination to determine cause of death"
postmortem (Adjective) — After death or after an event. ex. "a postmortem examination to determine the cause of death" ex. "the postmortem discussion of the President's TV address"
postmortem (Noun) — Discussion of an event after it has occurred.
postmortem (Noun) — An examination and dissection of a dead body to determine cause of death or the changes produced by disease.