This form is used with I to express identity, condition, location, or an auxiliary function.
I am ready to begin.
I am at home today.
AM follows a clock time to show that it occurs before midday.
The train leaves at 8:30 AM.
The office opens at nine AM.
This meaning refers to a broadcasting method in which the strength of a radio wave is varied.
The match was broadcast on AM radio.
This receiver supports both AM and FM.
