Good way to remember "middageten" Break it up. "Mid-dag-eten". Middle-day-eat. Same for dinner. "Avond-eten." I'm assuming "Avon" means late and "eten" means eat.
Depending on where in tje uk you are, the evening meal can be called dinner, tea or supper.
There is a lot of debate on this but technically 'dinner' is the biggest meal of the day. So where I live, in south Wales, people either have: Breakfast, Dinner, and Tea - or Breakfast, Lunch, and Dinner.