(used with a plural verb) the interactions that influence the attitudes and behavior of people when they are grouped with others through either choice or accidental circumstances.
(used with a singular verb) the study of such interactions.
Origin of group dynamics
First recorded in 1940–45
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for group dynamics
(functioning as singular) psychol a field of social psychology concerned with the nature of human groups, their development, and their interactions with individuals, other groups, and larger organizations
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012