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  1. 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 …

  2. What A.M. And P.M. Actually Stand For May Surprise You

    Nov 5, 2025 · Many people don't know what the abbreviations stand for — or how we should refer to noon and midnight.

  3. 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 …

  4. AM and PM - Meaning, Full Form of AM PM | Relation with 24 …

    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 …

  5. What Do AM and PM Mean? Definition, Examples, Facts.

    We can use any abbreviation, including am, a.m., AM, or A.M., to denote the ante meridiem. On the other hand, pm, p.m., PM, or P.M. is the abbreviation for post meridiem.

  6. AM Definition & Meaning - Merriam-Webster

    The meaning of AM is present tense first-person singular of be.

  7. 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 …

  8. A.m. Definition & Meaning | Britannica Dictionary

    The abbreviation a.m. stands for the Latin phrase ante meridiem, which means “before noon.”

  9. Amplitude modulation - Wikipedia

    Amplitude modulation (AM) is a signal modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave. In amplitude modulation, the …

  10. 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 …