proprium

noun
pro·​pri·​um | \ ˈprōprēəm\
plural propria\ -​ēə \

Definition of proprium

1 : property, attribute especially : an attribute belonging inseparably to every member of a species
2 : the principle of individuation in personality : selfhood

History and Etymology for proprium

Latin, possession, characteristic, from neuter of proprius own, particular

Keep scrolling for more