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1.
Late morning, early afternoon. Used to make up for lost time.
I'm sorry I missed you for breakfast, but at least I can join you for mornoon lunch.
by Pink Tornado March 16, 2008
 
2.
The time between 11:00am & 12:00pm.
I would like to have a snack around mornoon.
by SoSeducTIFF February 20, 2011
 
3.
Morning + Afternoon

A generic greeting for used during the day, primarily used online particularly when communicating with others in different time zones than yourself.
I greet both my West Coast and East Coast buddies with mornoon.
by XonyMudd October 16, 2009