The scheduled time for a lunch break at 12:00 is an example of noon.
Origin of noon
- Middle English non from Old English nōn canonical hour of nones (3 pm in early Middle Ages) from Late Latin nōna (hōra) ninth (hour after sunrise), nones feminine sing. of Latin nōnus ninth newn̥ in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition