関係【かんけい】
relation, relationship, connection, participation, involvement, concern, influence, effect, sexual relations, sexual relationship, related to, connected to
無関係【むかんけい】
unrelated
係員【かかりいん】
person in charge, official, attendant
係争【けいそう】
dispute, contention, conflict, controversy
連係【れんけい】
connection, linking, linkage, link, liaison, contact, coordination