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 12-hour clock system identifies all 24 hours of the day.

2019年10月3日 · What does a.m. mean? The term we associate with the morning, a.m., is an abbreviation of the Latin phrase ante merīdiem meaning “before midday.” What does p.m. mean? P.m. is an abbreviation of post merīdiem, meaning—you guessed it—“after midday.” These two terms help keep ambiguity at bay in the 12-hour time system. What does m. mean?

The meaning of AM and PM is ‘Ante Meridiem’ and ‘Post Meridiem’, which means before noon or midday. We associate P.M. with the afternoon and evening. P.M. is an abbreviated term for ‘Post Meridiem,’ which implies afternoon or after midday.

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 the time in the 12-hour clock format instead of using 24 hours.

2024年6月1日 · AM stands for “ante meridiem,” meaning before noon, and PM stands for “post meridiem,” meaning after noon. Noon, when the sun is highest in the sky, is neither AM nor PM. To avoid confusion, we use “12 noon” instead of “12 PM.”

2024年8月22日 · What Does “AM and PM” Stand For? We encounter "AM" and "PM" daily, but their meanings often go unnoticed. "AM" stands for "Ante Meridiem," meaning "before midday" in Latin. "PM" stands for "Post Meridiem," translating to "after midday."

2024年10月22日 · AM stands for Ante Meridiem, meaning "before midday," while PM stands for Post Meridiem, meaning "after midday." These abbreviations play a crucial role in differentiating the two 12-hour periods that make up a 24-hour day.

2021年8月11日 · “AM” stands for “ante meridiem.” The Latin phrase “ante meridiem” means “before noon” or “before midday.” That’s why, in the 12-hour system, all times from midnight onward use this designation....

2022年12月16日 · The abbreviation a.m. is short for the Latin ante meridiem, meaning "before noon," referring to the chunk of time from midnight until noon. The abbreviation p.m. is short for the Latin phrase post meridiem, which means "after noon." Srinivasan.Clicks/Shutterstock.

2025年1月3日 · You may already know that AM stands for ante meridiem, in Latin, which translates to 'before midday'. Meanwhile, PM stands for post meridiem, meaning 'after midday'. Royal Museums Greenwich explain that 'noon is therefore neither 'ante' (am) nor 'post' (pm) meridiem' and 'midnight is also neither AM or PM'.