In law, it often means "in practice but not necessarily ordained by law" or "in practice or actuality, but not officially established." - Seriously, it boggles my mind that these VERY simple things elude you people.
Printed copy · Anthology Volume 6, page 508Printed copy from The Tender For Law Anthology, Volume 6, page 508 (printed 13 June 2014). Added by this site; not part of the Facebook export.