The English word “dinner” originates from the French word “disnar,” which means breakfast. Back in the day, dinner was the name for the first meal of the day, which was eat at around noon. It was also meant to be the biggest meal of the day. The lighter meal that followed it in the evening was called “supper.”
Eventually, we began to add more and more meals to our schedule. People began eating meals before the large noon meal. Rather than calling these earlier meals dinner, dinner now only meant the largest meal of the day. Since a night-long fast is being broken with the first meal of the day, it was labelled “breakfast.” Over time, in many cultures that used these words to describe their meals, the largest meal of the day was gradually pushed later and later in the day, until it was had when we used to have supper.