Word of the week #8

So I am currently sitting in class and as my professor is, as usual, lecturing and presenting the class with a power point presentation so we can copy down notes. Right of the bat, the first slide that he presents to the class has a word that I don't know.

The slide reads as follows:

"The focus on leadership in the dyad"

According to Merriam Webster dictionary, dyad (n) is

1 : pair; specifically : two individuals (as husband and wife) maintaining a sociologically significant relationship

Example:

The most important relationships are those between a dyad.