1. 验尸；尸体检验；尸体解剖
A post-mortem is a medical examination of a dead person's body in order to find out how they died.

2. （尤指对失败或出差错的事情的）事后分析；事后检讨
A post-mortem is an examination of something that has recently happened, especially something that has failed or gone wrong.

e.g. The postmortem on the presidential campaign is under way.
正在对总统竞选活动进行反思。

noun

1. an examination and dissection of a dead body to determine cause of death or the changes produced by disease

Synonym: autopsynecropsypostmortemPMpostmortem examinationpost-mortem examination

2. discussion of an event after it has occurred

Synonym: postmortem