a connection, association, or involvement.

connection between persons by blood or marriage.

an emotional or other connection between people

the relationship between teachers and students.

a sexual involvement; affair.

noun

accord , affair , affiliation , affinity , alliance , analogy , appositeness , association , bond , communication , conjunction , consanguinity , consociation , contact , contingency , correlation , dependence , dependency , exchange , homogeneity , hookup , interconnection , interrelation , interrelationship , kinship , liaison , likeness , link , marriage , nearness , network , parallel , pertinence , pertinency , proportion , rapport , ratio , relation , relativity , relevance , similarity , tie , tie-in , tie-up , connection , interdependence , linkage , blood , cognation , friendship , kindred , tie in