Welted definition, a ridge or wale on the surface of the body, as from a blow of a stick or whip. See more.
AM stands for âante meridiemâ, which means âbefore noonâ in Latin, while PM stands for âpost meridiemâ, which means âafter noonâ in Latin. 12-Hour Periods. Most clocks today are 12-hour clocks â they divide the 24 hours in a day into two 12-hour periods.
The term we associate with the morning, a.m. , is an abbreviation the Latin phrase ante merÄ«diem meaning âbefore middayâ; p.m. is an abbreviation of post merÄ«diem, meaningâyou guessed itââafter midday.â These two terms help keep ambiguity at bay in the 12-hour time system.n formal writing, it is best to lowercase both a.m. and p.m. and retain the periods (as opposed to writing them AM / PM or am/pm); however, should you choose to use a different format, the most important rule is to be consistent throughout your piece.