Morning begins just after midnight and extends to just around midday or noon. Evening begins just after noon and extends to just around midnight. There is 12 hours in the morning and 12 hours in the evening. Together, they make 24 hours.
We use a.m. to show reference to the morning. It is Latin for ante meridiem (before midday).
We use p.m. to show reference to the night. It is Latin for post meridiem (after midday),
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