One of the mysteries of the English language finally explained.
After midday; applied to the hours between noon and midnight. Usually abbreviated P.M., p.m., or pm.
Mid 17th century; earliest use found in William Lilly (1602–1681), astrologer. From classical Latin post merīdiem after midday from post after + merīdiem, accusative of merīdiēs midday.
post meridiem/ˌpəʊs(t) mɪˈrɪdɪəm/
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