Use a legal dictionary to find the definition of legal terms. Legal dictionaries will often include supporting authorities for particular terms (e.g. relevant legislation or case law).
Following is information about the Encyclopaedic Australian Legal Dictionary. The Encyclopaedic Australian Legal Dictionary (Lexis Advance) contains over 25,000 definitions which are supported by Australian legislative and judicial authority, wherever it exists.
See the 'Reference & Encyclopedias' section of the Law Library website Research Databases by Type page for more dictionaries.