Relations

noun

1. The manner in which two things may be associated.

   "The relation between diet and health is complex."

2. A member of one's family.

   "Yes, he's a relation of mine, but only a distant one."

3. The act of relating a story.

   "Your relation of the events is different from mine."

4. A set of ordered tuples.
5. Specifically, a set of ordered pairs.

   "Equality is a symmetric relation, while divisibility is not."