diads

We go through trouble spots in our relationships, very much like 'ordinary' couples, and certainly feel advantaged over them we call them 'diads' in that we have more than 'just-one' partner to help us get through any problem areas that come up.

Philocrites: In praise of strategic thinking. 2004

The words monovalent, divalent, trivalent, tretravalent, etc., were coined to express this most important fact, and the various elements came to be known as monads, diads, triads, etc.

A History of Science: in Five Volumes. Volume IV: Modern Development of the Chemical and Biological Sciences 1904

If I understand Qgrrl’s position, she is arguing for the abolition of marriage, and for the extension of marriage related bennies to a larger set of arrangements that includes diads as a subset.

Reactions to the 11 ballot measures 2004