May 3, 2025 - A.M. stands for “ante meridiem” which means “before noon”. It refers to the time from 12:00 midnight until 11:59 in the morning. P.M. stands for “post meridiem” which means “after noon”. It refers to the time from 12:00 noon until 11:59 at night. On this worksheet, you will see pictures of different activities, like eating.