A function of the forces which lead members to remain in a group, including emotional connectedness to the group and shared group goals.
Example: Gymgoers who join an exercise class or group they enjoy are more likely to keep up with their fitness regime.
Grinnell, R. (2009). Group Cohesiveness. Psych Central. Retrieved on October 14, 2015, from http://psychcentral.com/encyclopedia/2009/group-cohesiveness/