Stormy S repliedThey can learn to spell correctly, they can learn the different meanings between words that sound alike such as there, their and they're or EXPECT and ACCEPT and learn that they are not interchangeable, which will help with their vocabulary, making them more intelligent as opposed to someone who doesn't use a dictionary.

Golden Ivy repliedThey expand their vocabulary and learn the definitions of words.
They learn the spelling of words and grammar.

helloo!* =] repliedumm, by learning the meanings of those words, how to spell them & putting those words into their vocabulary

sneezeslikejesus repliedthey cant

lyssa_mauk repliedexpand vocabulary
learn spellling
didnt you ask tis question before?

(: repliedMakes your vocabulary better!

its_victoria08 repliedWell, they can have a larger vocabulary, be able to express themselves better (knowing more words as a whole means they can find the precise word when needed), have better reading skills, and probably have much better language skills in general.

If you are thinking of having your own child study a children's dictionary, make sure you don't make it a chore. Try to make it fun by having a page to learn in a week and then doing a matching quiz to see how much they know or something like that. Your child probably will not be able to memorize the whole dictionary, so don't expect something like that.

But, I don't see anything wrong with it, as long as it's not used as a form of punishment.