luncheon的解释
n. 午宴,正式的午餐
luncheon的例句
We were invited to a formal luncheon.
我们被邀参加一次正式的午宴。

Thank you for your luncheon invitation for Sunday afternoon, January the tenth, at one o'clock.
感谢您邀请我（们）出席1月10日（星期天）下午1点举行的午餐。