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.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014