What does "P.M." stand for in terms of time?

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"PM" stands for "Post Meridian," which is derived from Latin. This term literally means "after noon." The 12-hour clock system divides the day into two segments: the first part runs from midnight to noon (12 AM), and the second part runs from noon to midnight (12 PM). So, when we refer to the time as being in the PM, we indicate that it is the period after 12:00 noon.

In contrast, "Pre Midnight," "Past Meridian," and "Pre Middle" do not accurately reflect the definition of PM. "Pre Midnight" suggests a time leading up to midnight, which can be misleading because PM covers the hours from noon until midnight. "Past Meridian" sounds similar but doesn't capture the specific meaning associated with the noon hour. "Pre Middle" is not a recognized standard term in timekeeping. Thus, understanding the terminology not only clarifies what PM signifies but also helps in accurately telling time within the 12-hour format.