Etymology
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post-mortem

also postmortem, 1734 as an adverb, "after death," from Latin post mortem, from post "after" (see post-) + mortem, accusative of mors "death" (from PIE root *mer- "to rub away, harm," also "to die" and forming words referring to death and to beings subject to death). From 1835 as an adjective, "subsequent to death." As a noun, shortening of post-mortem examination, it is recorded from 1850. The Latin phrase ante mortem "before death" is attested in English by 1823.

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Definitions of post-mortem

post-mortem (n.)
discussion of an event after it has occurred;
Synonyms: postmortem
post-mortem (n.)
an examination and dissection of a dead body to determine cause of death or the changes produced by disease;
Synonyms: autopsy / necropsy / postmortem / pm / postmortem examination / post-mortem examination
From wordnet.princeton.edu