When referring to timeshares, a constitution is legal documentation which describes and regulates the relationships between the management company, trustee, resort developer and timeshare owner. This legally-binding collection of inter-related documents acts as a set of rules and guidelines by which the resort is run and by which membership programs, privileges and expectations are established. When buying or selling timeshare, owners should be well versed on the particulars of their timeshare constitution. This document is something like a contract, outlining what owners can expect when purchasing, using or attempting to sell their timeshare.
Constitutions are drawn up by Timeshare Owners Associations, specific to individual resorts. If you want to ensure that you'll have fair say in the inner-workings and policies put forth by your resort and peers in ownership, joining and becoming a regular contributer to this owners' association is recommended.