This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A lunch, especially a formal one.

n. An afternoon party at which a light meal is served.

n. A formal meal served in the middle of the day.

v. To take luncheon.

n. A lump of food.

n. A portion of food taken at any time except at a regular meal.

n. A lunch, especially one organized by a group as a formal social gathering.

verb-intransitive. To take luncheon.

n. A large lump or piece, as of bread: same as lunch, Cotgrave.

n. A slight repast: same as lunch, 2. The form luncheon is now regarded as more “elegant” than lunch.

To take lunch or luncheon.

n. a midday meal

"‘lunch’ or ‘luncheon’ has now arrived, as when we read in the newspapers of a “magnificent _luncheon_”, is altogether modern; the word belonged a century ago to rustic life, and in literature had not travelled beyond the “hobnailed pastorals” which professed to describe that life."

repast    meal   

dejeuner    lunch    tiffin   

business lunch   

luncheonette   

lunch    repast    picnic    banquet    refreshment    dessert    dine    tea    reception    concert