What does post mortem mean

Post mortem, also known as autopsy, is where they examine a dead body to see what’s the cause of death.

They do this by opening the body and cutting open diff organs and such to see the cause and effects that led to their death.

If you’re looking at the business point of view, then post mortem means what they’ve conducted from their results from project.

For ex: was it successful, unsuccessful, risky, where does it need improvements and so on just so they know how to make it better next time.

This was already the answer "the use of academic language creates an angry and disdainful tone. the use of academic language gives the text a serious and instructive tone. the use of words with strong connotative meanings creates a sorrowful tone."

Permafrost is a thick layer of soil frozen throughout the year. two words to create permafrost would be permanent ice.