Forenoon
Encyclopedia
Forenoon is the time of day from 6:00 am to 12:00 noon.

The term should not be confused with "fore noon" (two separate words), which is a translation of the Latin "ante meridiem" (a.m.) as used in the 12-hour clock
12-hour clock
The 12-hour clock is a time conversion convention in which the 24 hours of the day are divided into two periods called ante meridiem and post meridiem...

, meaning a time of day from midnight to noon.
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