The 12-hour clock is a timekeeping convention in which the 24 hours of the day are divided into two periods called ante meridiem (am, Latin for "before midday") and post meridiem (pm, Latin for "after midday"). According to the actual meaning of the terms ante meridiem (am) and post meridiem (pm), noon (which falls precisely at the meridiem or celestial meridian) is neither am nor pm, because noon is neither before nor after itself.
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