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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 pm, the …

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.

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 eventually evolved …

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 “after …

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 which hour …

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 used to identify …

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 twelve-hour time.

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 and PM are common time expressions in English used in the 12-hour clock system. This guide explains their meaning, origin, and differences, shows how to write and pronounce them correctly, …