Absent limitation or restriction.
The term in blank is used in reference to negotiable instruments, such as checks or promissory notes. When such Commercial Paper is endorsed in blank, the designated payee signs his or her name only. The paper is not made payable to any one individual in particular, but anyone who presents it for payment is entitled to be paid.
IN BLANK. This is generally applied to indorsements, as, indorsements in blank, which is one not restricted, made by the indorser simply writing his name. See Indorsement.