with relation to something Definition

relation
noun

1. An act of relating.
2. A telling or narrating.
3. The state or way of being related.
4. A connection or relationship between one person or thing and another.

Thesaurus: similarity, connection, affiliation, relationship, bond, bearing, interdependence, propinquity, link, correlation, affinity, consanguinity.
5. Someone who belongs to the same family through birth or marriage; a relative.

Thesaurus: relative, kin, kinsman, kinswoman, sibling, cousin.
6. Kinship.
7a. Reference;
7b. Respect.
8. Social, political or personal contact between people, countries, etc.

Thesaurus: connections, contact, relationship, intercourse, affairs, interaction, dealings, communications, doings, rapport, associations.
Form: relations
9. euphemistic
Sexual intercourse.
Form: relations
10. philos.
A quality that can be predicated, not of a single thing, but only of two or more things together.

Idiom: in relation to something (with relation to something)

In reference to it; with respect to it.