Social Dilemma-Do You Say Supper or Dinner, And Is There A Difference?

Today's social dilemma came from a conversation we had at work earlier this week. It's a conversation I've had with people my entire life. It's about what meal you eat in the evening. Growing up, we always called your last meal of the day SUPPER. Of course, when I got older and started hanging out with other people I found out that a lot of people call it DINNER. And now I call it dinner too. I'll say I'm going out to dinner, not I'm going out to supper. So I believe they are the same thing. But one of my coworkers who grew up in the Midwest told me that they are not, in fact, the same thing. He said that dinner is actually what midwesterners call your midday meal, like lunch, and supper is what you eat as the last meal of the day. He said in the midwest, dinner around 1 in the afternoon is the biggest meal of the day and then at night you have a light supper before bedtime. I said here in the Northeast, all of our meals are big but I digress. I said here, supper and dinner are interchangeable. At least that's what I think. While I grew up saying supper, I say dinner more often now. What about you? What term do you use for the last meal of the day, and do you think both of those words mean the same thing? Let me know what you think on the TRY facebook page.