There is also a difference between a dictionary used for spell checking and a dictionary for definitions: smaller (within reason) is better for the former, whil

There is also a difference between a dictionary used for spell checking and a dictionary for definitions: smaller (within reason) is better for the former, while larger is better for the latter. (It is better to add an uncommon word to the user dictionary than it is to have a large number of uncommon words in the system dictionary since it is better to alert the user to a potentially misused word than to leave a misspelled word in place. Of course, this doesn't help in every case - as is evident with the common auto-correct snafus.)