Dictionary of Law (1893) - dictionary and compendium of American and English jurisprudence, first published in 1893.

Duhaime's Law Dictionary - volunteer project from the World Wide Legal information Association.

FindLaw: Dictionary - searchable database of legal terms.

International Law Dictionary and Directory - offers definitions of international legal terms along with descriptions and links to international organizations.

Jurisdictionary - useful facts about the words and the rules that lawyers use.

law.com: Law Dictionary - searchable database of legal terms.

Nolo.com: Everybody's Law Dictionary - contains plain-English definitions for legal terms.