Origin: Latin suffix -al
Relational has 2 different meanings across 1 category:
having a relation or being related
"The relational database organizes all data into interconnected tables that share common fields."
Relating to relations.
"The relational dynamics between the two departments caused several delays in the project."
The word relational comes from adding the suffix -al to relation. Its specific meaning regarding databases originated when that term was defined as a set of ordered tuples.