what's the meaning of am and pm
AM stands for âante meridiemâ, which means âbefore noonâ in Latin, while PM stands for âpost meridiemâ, which means âafter noonâ in Latin. Use midnight for 12 AM and noon for 12 PM.12 AM and 12 PM are often used, but do not technically make sense.Â©iStockphoto.com/Gordon Dixon.