Social stress: stress provoked by social stressors such as deprivation of social contact, disruption of social order, social rejection or high density living conditions (from Proudfoot & Habing, 2015). See the definition of stress. 

Proudfoot, K., & Habing, G. (2015). Social stress as a cause of diseases in farm animals: Current knowledge and future directions. The Veterinary Journal, 206(1), 15-21.