interrelation
    n 1: mutual or reciprocal relation or relatedness;
         "interrelationships of animal structure and function" [syn:
         interrelation, interrelationship, interrelatedness]

Interrelation \In`ter*re*la"tion\, n.
   Mutual or reciprocal relation; correlation.
   [1913 Webster]

INTERRELATION, civil law. The act by which, in consequence of an agreement, 
the party bound declares that he will not be bound beyond a certain time. 
Wolff, Inst. Nat. Sec. 752. 
     2. In the case of a lease from year to year, or to continue as long as 
both parties please, a notice given by one of them to the other of a 
determination to put an end to the contract, would bear the name of 
interrelation.