/ ˌpəʊst ˈmɔːtəm; NAmE ˌpoʊst ˈmɔːrtəm/ noun
1.
(also post-ˌmortem examiˈnation ) post-mortem (on sb) a medical examination of the body of a dead person in order to find out how they died
SYN autopsy :
to do / conduct / carry out a post-mortem
The post-mortem on the child revealed that she had been poisoned.
2.
post-mortem (on sth) a discussion or an examination of an event after it has happened, especially in order to find out why it failed :
to hold a post-mortem on the party's election defeat
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WORD ORIGIN
mid 18th cent.: from Latin , literally after death .