AM may refer to any of the following:
1. When referring to audio or a signal, AM is short for amplitude modulation. AM is a broadcast with the capability of broadcasting in a wide area, but in a lower quality when compared to FM.
2. When referring to time, am or a.m. is short for ante meridiem, which is Latin for "before the middle of the day" and can also mean "after midnight". This time is between 12:00 PM noon and after 11:59 PM midnight in a 24-hour time clock.
3. On the Internet .am is a top-level domain.