Purview
Etymology
From Anglo-French purveu, “provided,” past participle of purveier, “to provide” (Latin providere). Medieval English statutes opened with “Purveu est” — “It is provided” — so purview came to mean the enacting scope of a statute, then the general range of one’s authority or vision.
noun · /PUR-vyoo/
The scope of someone’s authority, responsibility, or concern.
What it names
The boundary of what falls to you — the range within which you have say or duty, and beyond which a matter is simply “not your purview.”
Example
Hiring is the manager’s call; payroll policy is above her purview.
Related idea
Purview is the range of what one may attend to; a remit is the specific task or mandate one has been assigned.