Question

who is the meaning of p.m. and a.m?why is it used?

Answer 1

AM—also spelled “am” or “a.m.”—is the abbreviation for ante meridiem, a Latin phrase meaning “before noon.” PM—also spelled “pm” or “p.m.”—is the abbreviation for post meridiem, which simply means “after noon.”

Answer 2

pm stands for Prime Meridian and a.m. stands for and time Meridian these were used by the people to to avoid confusion which was caused during the early days of life .