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

2019年10月3日 · 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 is present tense first-person singular of be.

Americium is a synthetic chemical element; it has symbol Am and atomic number 95. It is radioactive and a transuranic member of the actinide series in the periodic table, located under the lanthanide element europium and was thus named after the Americas by analogy. [5] [6] [7]

AM definition: 1. I form of be: 2. used when referring to a time between twelve o'clock at night and twelve…. Learn more.

12-hour clock, time convention that splits a 24-hour day into two equal 12-hour periods. 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 …

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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 into the two 12-hour periods which are used today, one called "a.m." starting at midnight and another called "p.m." starting at noon.

See examples of AM used in a sentence.