someone from tpuc (thanks nutty_norm) has asked the law society which dictionary they use and they cant tell you
http://www.tpuc.org/forum/viewtopic.php?f=4&t=2799As far as our library is aware, there is no one single source used in
the UK for legal definitions. Solicitors contact the library for
definitions which may come from a range of sources. In addition, we are
only able to comment on where definitions may be found within our own
collection; there may be other sources of legal definitions which the
library does not hold or have access to. If you wish to know the
dictionaries used within the HM Court Service, I suggest you contact the
courts directly for this information. From our library's own holdings,
two of the best known dictionaries giving details of where to find legal
definitions are the following:
1) Stroud's judicial dictionary of words and phrases. 7th ed (2007,
Sweet and Maxwell)
(this dictionary provides details of where words have been judicially
defined by the court)
2) Words and phrases legally defined. 4th ed (2008, LNB)
(this dictionary provides details of where words have been defined
within legislation)
In addition from our own experience, solicitors may request definitions
from a range of sources including the Oxford English Dictionary. The
consolidated index to Halsbury's Laws of England (4th and 5th eds) also
has a section called words and phrases which directs users to specific
passages within the 50+ volume publication. Legal definitions are often
found within the body of legislation; quite often Acts have a specific
section entitled definitions. Dictionaries such as Words and Phrases
note where these definitions may be found. In addition to these sources
the library has a further 22 dictionaries in our current law
dictionaries section and these provide information on legal definitions,
legal maxims, latin phrases etc. We also hold a range of other legal
dictionaries. Details of our library's holdings of legal dictionaries
can be found on the library's catalogue
http://www.lawsociety.org.uk/libraryonline. Select the Books search,
enter the phrase legal dictionaries within the keyword search box to
retrieve details of the dictionaries we hold. For your information, we
do not hold Black's law dictionary, 8th ed (2004).
As I mentioned before, this information is taken solely from our
library's holdings and should not be taken as a definitive list of
sources or as a recommendation should you wish to purchase or refer to
any of them.
Yours sincerely
Bob Stanley