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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 …

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 …

The first is referred to as am, which stands for ante meridiem, “before midday” in Latin, while the second is referred to using pm, meaning post meridiem, or “after midday.” This nomenclature …

AM broadcasting is radio broadcasting using amplitude modulation (AM) transmissions. It was the first method developed for making audio radio transmissions, and is still used worldwide, …

The meaning of AM and PM is the simple abbreviation of Latin phrases. In particular, AM stands for ante meridiem, which translates into English as ‘before midday’.

AM and PM are the abbreviated terms for Ante Meridiem and Post Meridiem respectively. While AM represents the time from midnight to 11:59 noon, and PM represents the time from 12 …

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 …

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 …

Definition of a.m. abbreviation in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.