olemus
Wiktionary:
1. connection or association; the condition of being related.
2. (mathematics) the links between the x-values and y-values of ordered pairs of numbers especially coordinates

näiteid
In UML, a relationship is a connection between model elements. A UML relationship is a type of model element that adds semantics to a model by defining the structure and behavior between model elements.

https://blog.visual-paradigm.com/what-are-the-six-types-of-relationships-in-uml-class-diagrams/