participation, subscription, joining

joining, connection, affiliation, unity

joining, alongside

partnership, joining, company

membership, joining

connection, anything to do with, participation; peculiarity, specialty, speciality, specialization; assignment, appropriation

relation, connection; need

connection, relation, bridge

relationship, connection, belonging; origin; preface, forward (in a book)

limitation, ban, restriction; taking control, doing well (ie. in moods etc.); linking, connection