One of the mysteries of the English language finally explained.
Used postpositively: subsequent to the existence of, or logically posterior to, something else.
Late 19th century; earliest use found in Mind. From classical Latin post rem, lit. ‘after the thing’, in post-classical Latin used with reference to different kinds of universal from post after + rem, accusative of rēs thing.
post rem/ˌpəʊs(t) ˈrɛm/
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