Contains plain-English definitions for hundreds of legal terms. There is a search feature (click on the magnifying glass and then use the pull down menu to the left of the search box to limit your Nolo search to the "Dictionary"). One may also browse an alphabetical listing of terms.
Wex is both a legal dictionary and encyclopedia offered by the Legal Information Institute at the Cornell Law School. Wex definitions are "collaboratively created and edited by legal experts" and can be found through a search or by browsing an alphabetical listing of terms.
Guide to "abbreviations for English language legal publications from the British Isles, the Commonwealth, and the United States, including those covering international and comparative law." Maintained by Cardiff University in Wales.
This site, maintained by Kelly L. Smith of the UC San Diego Library, "lists acronyms and abbreviations commonly used by the United States federal government. Each acronym is defined and links to the home page (or best alternative) of the identified department, agency, office, program or publication."