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AM and PM: What Do They Mean? - timeanddate.com
AM means before noon. This is the 12-hour period from midnight to noon. PM means after noon. It covers the 12 hours from noon to midnight. Using numbers from 1 to 12, followed by am or …
12-hour clock - Wikipedia
Originally there were two cycles: one cycle which could be tracked by the position of the Sun (day), followed by one cycle which could be tracked by the Moon and stars (night). This …
What Do AM and PM Stand For? - Britannica
The abbreviation am stands for ante meridiem, “before midday” in Latin, while pm means post meridiem, or “after midday.” The concept of a 12-hour clock has been around since ancient times.
Why We Say a.m. and p.m. and What They Actually Mean
Jul 2, 2025 · Turns out, the answer goes back to ancient Rome and the way they watched the sky. Quick insight: a.m. means “ante meridiem” or “before midday.” p.m. means “post meridiem” or …
What do AM and PM mean? - World Time Clock & Map
In particular, AM stands for ante meridiem, which translates into English as ‘before midday’. Meanwhile, PM is post meridiem and means in English ‘after midday’. These abbreviations are …
What Do AM and PM Stand For? | Meaning & Examples - QuillBot
Jun 3, 2025 · AM and PM stand for “ante meridiem” (before midday) and “post meridiem” (after midday). In parts of the world with a 12-hour time system, people use “a.m.” or “p.m.” to clarify …
am, pm or a.m., p.m. | Online English Usage Dictionary
Separate the abbreviations from their number with a non-breaking space. The abbreviations stand for ante meridiem (before noon) and post meridiem (after noon) and are used strictly with …
AM | English meaning - Cambridge Dictionary
AM definition: 1. I form of be: 2. used when referring to a time between twelve o'clock at night and twelve…. Learn more.
AM. Definition & Meaning | Dictionary.com
The abbreviation a.m. for Latin ante merīdiem, meaning “before noon,” refers to the period from midnight until noon. One minute before noon is 11:59 a.m. One minute after noon is 12:01 …