New word (for me): Daypart (re: food service industry)

This item about ongoing declines in the food service industry is mildly interesting. Is the Great Recession really over? What caught my eye was a new (to me) term: Daypart. Here’s some context (emphasis added):

According to CREST®, traffic declined across all restaurant segments and dayparts.This summer visits to quick service/fast food restaurants (QSR) declined by -3 percent. Casual dining declined -4 percent and midscale was down -5 percent. Visits at the supper daypart fell for the seventh consecutive quarter declining in the summer quarter (June, July and August) by -6 percent versus a year ago. Lunch visits contracted by -4 percent, morning meal traffic fell by -2 percent, and PM snack, which showed positive growth (+1 percent) in the spring quarter, declined by -2 percent this past summer.