One of the mysteries of the English language finally explained.
Before midday; applied to the hours between midnight and the following noon. Usually abbreviated a.m., a.m., or am.Related antemeridian
Mid 16th century; earliest use found in John Dee (1527–1609), mathematician, astrologer, and antiquary. From classical Latin ante merīdiem before midday from ante before + merīdiem, accusative of merīdiēs noon.
ante meridiem/ˌanteɪ mɪˈrɪdɪəm//ˌanti mɪˈrɪdɪəm/
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