This is what Barron's Law Dictionary defines:


INDORSEMENT signature placed upon theback of an instrument, with or without other words, whose effect is to transfer the instrument and create "a new and substantive contract by which the indorser becomes a party to the instrument and becomes a party to the instrument and liable on certain conditions for it's payment".& 370 S.W. 2d 811, 813 n. 4.& To constitute an indorsment, the writing must be effective to transfer the entire instrument to which it is affixed; otherwise it operates as only a partial assignment. UCC 3-203(3), which is merely a transfer of title. 182 N. W. 409, 413