What bothers me is how you can find a lot of common words with many contrived definitions listed: things like
"dog: a member of the genus Canis (probably descended from the common wolf) that has been domesticated by man since prehistoric times",
"table: a piece of furniture having a smooth flat top that is usually supported by one or more vertical legs", etc. I really hope there aren't any schools making kids memorize these definitions.
My first thought was that these might be sets for English language learners, but the language used in the definitions generally uses a pretty diverse vocabulary. I doubt it's meant for beginners.