“Relation” versus “relationship” in RDBMS/SQL?

Question

Coming from question “Relation” versus “relationship”

What are definitions of \"relation\" vs. \"relationship\" in RDBMS (or database theory)?

Update:
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Answer 1

A RELATION is a subset of the cartesian product of a set of domains (http://mathworld.wolfram.com/Relation.html). In everyday terms a relation (or more specifically a relation variable) is the data structure that most people refer to as a table (although tables in SQL do not necessarily qualify as relations).

Relations are the basis of the relational database model.

Relationships are something different. A relationship is a semantic "association among things".