English definition of “relation”
CONNECTION [C, U] › a connection between two or more things: the relation between smoking and lung cancer
FAMILY [C] › 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 › when compared with something: Salaries are low in relation to the cost of living. › about or relating to something: I'd like to ask you something in relation to what you said earlier.