noun
luncheon
LUN-chun/ˈlʌntʃən/
A formal or organized midday meal.
The guests enjoy a formal luncheon at the neatly arranged table.

Etymology
Luncheon first meant a thick piece of food, then a light meal between mealtimes. Its origin is uncertain, though its meal sense may have been influenced by nuncheon, a word for a light midday meal.
In context
at noon at a spot previously arranged, we found the ladies awaiting us with luncheon spread under the trees.
More examples
- The association hosted a charity luncheon.
- We received an invitation to the luncheon.
- Several luncheons honored the visiting delegates.
Forms
luncheon · luncheons