Forenoon
/ˈfɔːrnuːn/
Definition 1 of 1
Pro Tip 1/3Time Span
Forenoon is specific to the period before noon but after sunrise, not early morning or pre-dawn hours. 
She went jogging in the forenoon, just after breakfast.
Pro Tip 2/3Archaic Usage
Forenoon is rarely used in modern English; 'morning' is far more common now. 
Grandfather would say 'forenoon' while I'd just say 'morning'.
Pro Tip 3/3Regional Preference
Some UK regions and older texts may still use 'forenoon', giving a traditional or historical feel. 
The meeting is set for the forenoon, as per the old British schedule.