proprium

[proh-pree-uh m] /ˈproʊ pri əm/
noun, plural propria [proh-pree-uh] /ˈproʊ pri ə/ (Show IPA). Logic.
1.
a nonessential property common to all the members of a class; attribute.
British Dictionary definitions for proprium

proprium

/ˈprəʊprɪəm/
noun
1.
(logic, obsolete) Also called property. an attribute that is not essential to a species but is common and peculiar to it
Word Origin
C16: Latin, neuter sing of proprius proper, own