[noun] [U]The relation between two things is the connection or similarity between them.The relation between the original book and this new film is very faint.She bears no relation to (= She is not similar to) her brother.See also relations at relate to.Someone who is your relation is a member of your family.She's a relation by marriage because she married my cousin.The funeral was attended by friends and relations.In/With relation to means in connection with.She used the map to discover where she was in relation to her surroundings.
Meaning of RELATION in English
Cambridge English vocab. Кембриджский английский словарь. 2012