proprium

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pro·pri·um

 (prō′prē-əm)
n. pl. pro·pri·a (-prē-ə)
In Aristotelian thought, a predicable property common to all members of a kind but not constituting part of the definition of that kind.

[Medieval Latin, from neuter of Latin proprius, proper (to) (translation of Greek idion); see per in Indo-European roots.]

proprium

(ˈprəʊprɪəm)
n
(Logic) logic obsolete Also called: property an attribute that is not essential to a species but is common and peculiar to it
[C16: Latin, neuter sing of proprius proper, own]