this approach quite frequently in my school. I'm not sure where it came from, I'm not even sure I think it's good, but the kids love it!
The teacher gives them a word such as continent and asks the children what it is NOT? They say things like a continent is NOT a crayon, it's not apiece of paper, it's not an apple, all sorts of silly things. Then they learn the REAL definition. They draw a picture of the real thing with all the above in quadrants of the paper. Hmm ..weird huh? But they like it.
