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"Noun: A logical or natural association between two or more things.
relation,
relationship,
connection,
correlation,
interrelation,
interdependence,
interrelationship,
tie-in,
interconnection.

Verb: To unite or be united in a relationship.
join,
relate,
associate,
combine,
bind,
connect,
ally,
affiliate,
conjoin."
(from Roget's II Thesaurus)

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