a.m. or AM or Brit am abbreviation
in the morning — used with numbers to show the time of day ▪ She woke up at 6 a.m. and didn't go to bed until midnight. ▪ The class is held from 11:30 a.m. to/until 2:15 p.m. ▪ 12 a.m. [=midnight, one hour after 11 p.m.] ◊The abbreviation a.m. stands for the Latin phrase ante meridiem, which means “before noon.” — compare p.m.
