What is the meaning of Relational?

Relating to relations.

Friendly and peaceful.

Of a database technology using tables and adhering to Codd’s 12 rules.

Dealing with the whole of human relations and their social context, rather than an independent and private space.

Pertaining to a relational adjective, i.e. an adjective that relates what it modifies to a noun rather than qualifying it.

relational

Source: wiktionary.org