What's high tea?

(It was always supper to me. For some reason I always thought that dinner was 'fancy' and supper was a big meal falling somewhere near the hour my mom got home from work. In short, dinner was what ya had at someone else's house where ya had to mind yer p's and q's and yer elbow on the table--which ya had to mind at home or ya got a fork in the arm and all ya got at someone else's house was a glare that was followed by a clip across the head at the earliest opportunity when no one was looking, but sometimes the adults forgot, especially if ya didn't talk outta turn and said thanks without burping.)

Is high tea a meal?