Ex postulates is a term that is not commonly used in everyday language, but it refers to assumptions or ideas made after an event has already occurred. There are several synonyms for ex postulates that can be used to convey the same concept. One synonym is retrospective assumptions, which refers to ideas or assumptions made after the fact. Another synonym is post hoc reasoning, which implies that a conclusion is drawn based on events that have already happened. Other synonyms include hindsight bias, after-the-fact thinking, and looking back, all of which refer to the tendency to make assumptions or judgments based on past events.