As an abbreviation of Latin ante meridiem ‘before noon’, a.m. is pronounced as two letters and written in the form 8.15 a.m. (or am; in AmE 8:15 a.m.). Note that 12.00 a.m. is midnight and 12 p.m. is midday; because of the uncertainty these designations cause, the explicit forms 12.00 midnight or 12.00 midday are often to be preferred. The abbreviation is sometimes used informally as a noun: I arrived here this a.m.

Modern English usage. 2014.

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