Our family calls the noon meal “lunch” and the evening meal “supper” – but I often feel out-of-step with my friends and neighbors who all eat “dinner” in the evening. So I was fascinated to read what it said in a 1921 home economics textbook about which meal was which:
In some families the meal served at noon is called luncheon and is followed by dinner in the evening; in others, dinner is the meal served at noon, followed by supper in the evening. Luncheon and supper are simpler meals than dinner.
Elementary Home Economics (1921) by Mary Lockwood Matthews