dyad

A set of two elements treated as one; a pair.

[…] positing a dyad and constructing the infinite out of great and small, instead of treating the infinite as one, is peculiar to him; […]

McNamee describes their grip on the company as “the most centralized decision-making structure I have ever encountered in a large company.” Their power dyad is possible only because Facebook’s “core platform,” as McNamee puts it, is relatively simple: It “consists of a product and a monetization scheme.”

Two persons in an ongoing relationship; a dyadic relationship.

For each individual in a specific dyad (i.e., mother-offspring, offspring-father, sibling-sibling), […]

The relationship or interaction itself in reference to a couple.

Any set of two different pitch classes.

An element, atom, or radical having a valence of or combining power of two.