aliorelative
/ˌalɪəʊˈrɛlətɪv/Logic and Philosophy
noun
A relation which can never hold between a term and itself; an irreflexive relation. Now rare.
adjective
Designating a relation which can never hold between a term and itself.
Origin
Late 19th century; earliest use found in Charles Peirce (1839–1914), scientist and philosopher. From classical Latin alius other + -o + relative.