Definitions need work

5-star app with 3-star definitions. Look up a word in this app--say, "perfunctory"--then in the Merriam Websters or American Heritage and see how much richer it is in the latter. Of course thats not the point-- the object here is to learn vocabulary, nuances of which can be discerned later. I just know it could facilitate word retention if I could delve into more specificity, or etymology in the process.

Dementior about Word Vault: Vocabulary Builder