If I have a decent Hebrew knowledge, but not great, what books (i.e. dictionaries, lexicons, etc.) should I have at hand when I'm learning a sefer, such as the Mishneh Torah?
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In addition to Shalom's recommendations for dictionaries:
I'd probably say to keep Jastrow's dictionary handy.
Rambam's writing in particular played a major influence on modern Hebrew, so even a modern Hebrew dictionary will work nicely (though occasionally be prepared for words that mean different things today than they did 800 years ago).