What is the meaning of AM and PM?

Answer

AM means after midnight whereas PM means after midday. It is desirable to use 12 midnight and 12 noon where clarity is needed. To avoid ambiguity, railroads, airlines and insurance companies use 12:01 am for an event that begins during the day and 11:59pm for the ending of a day.
2 Additional Answers
Ask.com Answer for: what is the meaning of am and pm
AM and PM stand for ante meridiem and post meridiem.
The acronyms am and pm stand for ante meridian and post meridian. Ante is Latin for before while post is Latin for after. Meridian on the other hand is the accusative form of median, meaning midday.
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