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a.m.
Master of Arts.
before noon.
the period from midnight to noon, especially the period of daylight prior to noon:
Shall we meet Saturday a.m.?
a morning newspaper, sometimes issued shortly before midnight.
Agricultural and Mechanical (college):
Texas A and M.
Contemporary Examples

At 4:07 A.M. with the police officer and paramedic unable to control Anderson, the driver pulled over, Neiman said.
Porn Star Sledge Hammer’s Hidden Demons Maria Elena Fernandez April 22, 2012

The Los Angeles Fire Department ambulance arrived at 3:41 A.M., Neiman said.
Porn Star Sledge Hammer’s Hidden Demons Maria Elena Fernandez April 22, 2012

Twelve hours after the ship left Cozumel, at about 5:30 A.M. on Sunday, the Shanars awoke with a start.
We Survived the Triumph: Passengers Describe Their Doomed Carnival Cruise Winston Ross, Eliza Shapiro, Sam Register February 15, 2013

On Sunday night, both spouses woke up first at 2:00 A.M. and then again at 5:00 A.M. because of artillery shelling.
Mom and Pop on Ukraine’s Battle Line Anna Nemtsova June 1, 2014

At 10:30 A.M., the girls called their father at his job and told him they were going to the library.
How ISIS’s Colorado Girls Were Caught Michael Daly October 21, 2014

Historical Examples

By 10 A.M. a retiring French battalion marched through, and reported that the line was again being withdrawn.
Pushed and the Return Push George Herbert Fosdike Nichols, (AKA Quex)

By eleven, A.M., we were twenty miles inside the outer cape.
Left on Labrador Charles Asbury Stephens

At seven o’clock, A.M. of that day, they were aroused from a lethargy by the cheering cry of the steersman, “there’s a sail!”
Thrilling Stories Of The Ocean Marmaduke Park

My train is to be 11 A.M. from Shoreditch; which gets to Ipswich about two?
Letters of Edward FitzGerald Edward FitzGerald

There was a nice breeze from the eastward at 10 A.M., and like a flight of swans the yachts were away together.
Yachting Vol. 2 Various.

abbreviation (indicating the time period from midnight to midday)
ante meridiem Compare p.m.

also AM, type of radio wave broadcast; see amplitude.
Latin ante meridiem (before noon)
airmail
Latin anno mundi (in the year of the world)
Latin ante meridiem (before noon)