Carte Blanche
The Cyclopedic Law Dictionary · Walter A. Shumaker and George Foster Longsdorf; ed. James C. Cahill · 1922
The Cyclopedic Law Dictionary
A white card signed at the bottom with a person's name, and soraeitimes sealed, giving another person power to superscribe what conditions he pleases. Applied, generally, in the sense of unlimited authority being ' granted.
Wharton.