relation

noun10

1. •
   a way in which two things go together, so that one may change or explain the other

   • The relation between diet and health is complex.
   • There's no linear relation between mortality and size.
2. •
   [in the plural] A relationship; the manner in which and tone with which people or states, etc. interact.

   • the foreign relations of the United States
3. •
   A member of one's extended family; a relative.

   • Yes, he's a relation of mine, but only a distant one.
4. •
   [in the plural] (euphemistic) The act of intercourse.

   • have relations with
   • have sexual relations with
5. •
   The act of relating a story.

   • Your relation of the events is different from mine.
6. •
   A set of ordered tuples.
7. •
   A set of ordered pairs; a binary relation.

   • Equality is a symmetric relation, while divisibility is not.
8. •
   A set of tuples, implemented as a table in a relational database.

   • This relation uses the customer's social security number as a key.
9. •
   A statement of equality of two products of generators, used in the presentation of a group.
10. •
    A subobject of a product of objects.