1 adj Proprietary substances or products are sold under a trade name.
FORMAL ADJ n (Antonym: generic)
...some proprietary brands of dog food..., We had to take action to protect the proprietary technology.
2 adj If someone has a proprietary attitude towards something, they act as though they own it.
FORMAL usu ADJ n
Directors weren't allowed any proprietary airs about the product they made.
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