1Lunch; the midday meal. 昼ごはん is the everyday spoken word; 昼食 is its more formal written counterpart, and ランチ is common in dining-out and café contexts.
昼ご飯は駅前のカフェでサンドイッチを食べた。
I had a sandwich for lunch at a café near the station.
今日は忙しくて、デスクで昼ごはんを済ませた。
I was busy today, so I just had lunch at my desk.
母が作ってくれた弁当を昼ご飯に食べた。
I had the bento my mom made for me as lunch.
今日の昼ごはん、何にする？
What should we have for lunch today?
久しぶりに友達と昼ご飯を食べに行く約束をした。
I made plans to go out for lunch with a friend for the first time in a while.