The basic meaning of the prefix post- is “after.” It comes from Latin post, meaning “behind, after.” Post- is often used in opposition to the prefixes ante- and pre-: antedate/postdate; prewar/postwar. And post- occurs frequently in medical terminology. Postnasal and postnatal are two common examples, but there are many others, such as postcranial (“behind the cranium”) and postvertebral (“behind the vertebrae”).
