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1Logic
= "property".
2Chiefly . An essential attribute of something, a distinctive characteristic; essential nature, selfhood.
Mid 16th century; earliest use found in Thomas Wilson (d. 1581), humanist and administrator. From classical Latin proprium one's own property, special feature or property, peculiarity, in post-classical Latin also essential attribute or characteristic, property in logic, use as noun of neuter singular of proprius proper.