Term: partnership: a cooperative relationship between people or groups who agree to share responsibility for achieving some specific goal
Broader: relationship: a relation between people; (`relationship' is often used where `relation' would serve, as in `the relationship between inflation and unemployment', but the preferred usage of `relationship' is for human relations or states of relatedness) | Unrelated: politics: the opinion you hold with respect to political questions
Broader: relationship: a relation between people; (`relationship' is often used where `relation' would serve, as in `the relationship between inflation and unemployment', but the preferred usage of `relationship' is for human relations or states of relatedness) | Unrelated: jackstraws: a game in which players try to pick each jackstraw (or spillikin) off of a pile without moving any of the others