Meaning of “cohesion” - Learner’s Dictionary

cohesion

noun [ U ] uk us /kəʊˈhiːʒən/

a situation in which the members of a group or society are united:

The country needs greater social cohesion.
cohesive uk us /kəʊˈhiːsɪv/ adjective

united and working together effectively:

a cohesive unit/group

(Definition of “cohesion” from the Cambridge Learner’s Dictionary © Cambridge University Press)