专有 is an attributive adjective used in formal or technical contexts to indicate that something belongs exclusively to a particular person, group, or category. It appears in compounds like 专有名词 (proper noun), 专有技术 (proprietary technology), and 专有权 (exclusive right). The three English glosses — 'proper', 'proprietary', 'unique' — each apply to a different compound, so the word itself is not interchangeable across those senses; you must learn the full compound.