1The motivation or ethos underlying the action or behaviour of a group; (later usually) the manner in which the members of a group interact; an instance of this.
2Attributive of or relating to group dynamics.
Origin
1920s.
Definition of group dynamic in US English:
group dynamic
noun
Sociology
1The motivation or ethos underlying the action or behaviour of a group; (later usually) the manner in which the members of a group interact; an instance of this.