As an abbreviation of Latin ante meridiem, meaning ‘before noon’, a.m. is pronounced as two letters and written with two full stops in the form 8.15 a.m. (in American English 8:15 a.m.). Note that 12.00 a.m. is midnight and 12.00 p.m. is midday, but because of the uncertainty these designations cause, the explicit forms 12 midnight and 12 noon or 12 midday are clearer. The abbreviation is sometimes used informally as a noun: I arrived here this a.m., but this use is not acceptable in any kind of formal writing.
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