A.m. (noun)

The period of time from midnight to noon, especially the period of daylight before noon.

Origin:

Abbreviation of latin ante merīdiem.

Examples:

1. The meeting is scheduled for 9 a.m.
2. She wakes up at 6 a.m. every morning.
3. The store opens at 10 a.m.
4. The flight departs at 7 a.m.
5. The event will start at 8 a.m.