Oxford University Press recently released the third edition of Bryan A. Garner’s dictionary of legal usage.
It’s Its predecessor, A Dictionary of Modern Legal Usage (2d ed. 1995) is 16 years old, so it was due for an update. The third edition has a new title, Garner’s Dictionary of Legal Usage. It also features citations for illustrative quotations (the first and second editions omitted those citations). OUP lists the selling price as $65, but I got mine from Amazon.com for considerably less.
If you take your legal writing seriously, you need a book like this within arm’s reach of your desk.