Ante meridiem is a Latin term, which means "before noon" or "AM." The antonyms of ante meridiem are post meridiem or "after noon" or "PM". These two Latin terms are frequently merged with timekeeping, particularly digital clocks, to enable simple comprehension of whether a specific time is in the morning, afternoon, evening, or night. Nevertheless, there are no other often-used antonyms for ante meridiem, as it has a quite specific meaning. In brief, when someone refers to an event occurring AM or PM, it denotes the period of the day when the sun crosses the meridian.