American Heritage Dictionary
Century Dictionary
(1)
GNU Webster's 1913
(1)
WordNet
Elsewhere on the web
Baldwin's manner on the set was proprietorial: "Can we do that without the tubercular cough in the background?"— Waxy.org Links
You would either have to be very stuffy, or inappropriately proprietorial about the two of them, to object to the word marriage.— National Review Online
The process of PRINCE2 is in the world domain, offering up non-proprietorial most adept exercise direction with project management.

Century Dictionary (1)
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