The term 'opposite of post' can be answered with two words: 'pre' and 'ante'. Pre is a three-letter word meaning 'BEFORE', while ante is a four-letter word meaning 'prior to'. Both words refer to something that happened or existed BEFORE something else. Pre and ante are often used in legal contexts, such as when referring to the time BEFORE a contract was signed. They can also be used in everyday language to refer to something that happened BEFORE another event.