Ante-dates, which means to date something before its actual time, can have several antonyms, including post-date, contemporize, or synchronize. Post-dating refers to dating something after its actual time, while contemporize means to bring something up to the current time or to synchronize with the present. Synchronize, on the other hand, refers to coordinating the timing of two or more events to occur at the same time. All these antonyms provide opposite meanings to ante-dates, and using them helps to provide clarity in communication and avoid confusion. By understanding the antonyms for this word, writers and speakers can make sure their writing or speech is accurate and precise.