Definition : is a site for the popularization of co-ownership law set up by the author and lawyer emeritus Me Yves Joli-Cœur. Its main mission is to help co-owners, administrators and professionals form an informed opinion on issues related to divided co-ownership.

This site brings together on the same platform factsheets, chronicles, videos, news and a glossary with more than 1500 definitions. Various topics are covered, namely Purchase, Syndicate, Management, Insurance, Work and Your rights.