(semantics) A term that, together with another term, forms a pair of opposite role names in a relationship, such as parent and child.

plural of binary relation

plural of relational database

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

plural of blood relation

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

plural of equivalence relation

public relations (in attributive use)

(Marxism) The sum total of social relationships that people must enter into in order to survive, produce, and reproduce their means of life.

Something seen as inferior.