relationship

noun6

1. •
   a connection between two or more people or things
2. •
   A romantic or sexual involvement.

   • They have been in a relationship for ten years, but have never married.
3. •
   A way in which two or more people behave and are involved with each other.

   • I have a good working relationship with my boss.
4. •
   The links between the x-values and y-values of ordered pairs of numbers especially coordinates.

   • Policing the relationship between government and business in a free society is difficult. Businesspeople have every right to lobby governments, and civil servants to take jobs in the private sector. — 2013
5. •
   The level or degree of affinity between keys, chords and tones.
6. •
   Kinship; being related by blood or marriage.