what does am and pm stand for
What does AM and PM stand for? AMâalso spelled âamâ or âa.m.ââis the abbreviation for ante meridiem, a Latin phrase meaning âbefore noon.â PMâalso spelled âpmâ or âp.m.ââis the abbreviation for post meridiem, which simply means âafter noon.â Noon, of course, refers to the middle of the day.