A person who is relation through birth, as opposed to marriage or adoption.

The patterns of behaviour between ethnic groups of people / The branch of sociology that studies these patterns

plural of binary relation

public relations (in attributive use)

(linguistics) Any of various possible semantic relations between a verb and its arguments.

(mathematics) an equation that recursively defines a sequence; each term of the sequence is defined as a function of the preceding terms.

plural of blood relation

plural of equivalence relation

Something seen as inferior.

The study of relationships among countries, commonly abbreviated as IR. / The relationships themselves