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AM and PM Full Form – What is the Full Form of PM ? PM stands for “post meridiem,” which is a Latin phrase that means “after noon.” It is used to indicate the time of day after midday, between 12:00 PM and 11:59 PM . The term “post” means “after,” and “meridiem” means “midday” in Latin. So, PM literally translates to “after midday.” AM covers the time from midnight (12:00 AM) to just before noon (11:59 AM), while PM covers noon (12:00 PM ) to just before the next midnight (11:59 PM ). This distinction divides the 24-hour day into two 12-hour periods for clear time identification. The 12-hour system splits a day’s time cycle into two parts. AM or Ante Meridiem represents the first period. AM or it is full form Ante Meridiem describes the midnight to noontime. The full form of PM is Post Meridiem . PM denotes post-midday period. It is another unit of the convention time which is associated with the 12-hour clock.