membership noun 3verb 1forms 3 noun3 •The state of being a member of a group or organization.The terms of membership agreement were vague.He has memberships in clubs in three cities. •The fact of being a member of a set. •The body of members of an organization.The memberships of the state chapters elect delegates to the national convention. verb1 •To classify (someone) as belonging to a certain group or community. formsmembershipped · membershipping · memberships