Pronunciation: (lunch),[key] —n. 1. a light midday meal between breakfast and dinner; luncheon.
2. any light meal or snack.
3. a restaurant or lunchroom: Let's eat at the dairy lunch. 4. out to lunch,Slang.not paying attention or tending to business; negligent: You must have been out to lunch when you wrote that weird report.
—v.i. to eat lunch: We lunched quite late today.
—v.t. to provide lunch for: They lunched us in regal fashion.