cohesion       
noun [ U ]  formal uk/kəʊˈhiː.ʒən/ us/koʊˈhiː.ʒən/ (also cohesiveness, /kəʊˈhiː.sɪv.nəs/ /koʊˈhiː.sɪv.nəs/)
 凝聚(力);团结
the situation when the members of a group or society are united
  social/national cohesion 社会/国家凝聚力 
 The lack of cohesion within the party lost them votes in the election. 党内缺乏凝聚力使他们在选举中失去了选票。