Mathematics and Logic. Of a mathematical and logical relation: such that if a first item is related to a second item as the second is related to a…

Logic. Of a relation: such that if the relation holds between a first and a second item, and also between the second and third, it cannot hold…

Not reflexive. spec. in Logic and Mathematics, of a relation which no postulate can have to itself. See also non-reflexive, adj., reflexive, adj.

Logic. Pertaining to or designating a relation between exactly two entities, or a predicate expressing such a relation. Also transferred, esp. in M…

Mathematics. Applied to an expression, function, or equation whose value is never altered by interchanging the values of any two of the variables…

Mathematics and Logic. Relating to or designating a relation which may, but need not, hold between a term and itself. Cf. irreflexive, adj., reflexive…

Of, relating to, or of the nature of a polyad (in various senses); consisting of or involving many (usually more than two) elements, quantities…

Logic. Of a binary relation: such that when two terms for which it is true are interchanged, it remains true.

Of or relating to mereology.