1.NounA person or firm that owes money; one in debt; one who owes a debt.
"The debtor agreed to repay the loan within six months.; The law protects both the debtor and the creditor."
2.NounOne who owes another anything, or is under obligation, arising from express agreement, implication of law, or principles of natural justice, to pay money or to fulfill some other obligation; in bankruptcy or similar proceedings, the person who is the subject of the proceeding.
"As a debtor, he faced constant letters from the bank."