relatedness Definition

1a. Belonging to the same family;

Thesaurus: kin, kindred, akin.
1b. Connected by birth or marriage.
2. Connected.

Thesaurus: interconnected, affiliated, linked, kindred, associated, joint, linked, accompanying, akin, correlated, concomitant; Antonym: different, unconnected.
3. music.
Referring to or indicating a key that shares notes with another key or keys.