Meaning of “relation” - Learner’s Dictionary

relation

noun uk us /rɪˈleɪʃən/
CONNECTION [ C, U ]

B2 a connection between two or more things:

the relation between smoking and lung cancer
FAMILY [ C ]

B1 someone who belongs to the same family as you:

He's called Ken Russell, no relation to (= he is not from the same family as) the film director.
in relation to sth

B2 when compared with something:

Salaries are low in relation to the cost of living.

B2 about or relating to something:

I'd like to ask you something in relation to what you said earlier.

(Definition of “relation” from the Cambridge Learner’s Dictionary © Cambridge University Press)