debt

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Something owed, such as money, goods, or services.
• noun An obligation or liability to pay or render something to someone else.
• noun The condition of owing.
• noun Financial instruments, such as bonds, mortgages, and loans, that represent a claim to payment and rights of creditorship.
• noun A moral or legal obligation to make reparations or undergo punishment for committing an offense.

from The Century Dictionary.

• noun That which is due from one person to another, whether money, goods, or services, and whether payable at present or at a future time; that which one person is bound to pay to or perform for another; what one is obliged to do or to suffer; a due; a duty; an obligation.
• noun The state of being under obligation to make payment, as of money or services, to another; figuratively, the state of being under obligation in general.
• noun An offense requiring reparation or expiation; default of duty: a trespass; a sin.

from the GNU version of the Collaborative International Dictionary of English.

• noun That which is due from one person to another, whether money, goods, or services; that which one person is bound to pay to another, or to perform for his benefit; thing owed; obligation; liability.
• noun A duty neglected or violated; a fault; a sin; a trespass.
• noun (Law) An action at law to recover a certain specified sum of money alleged to be due.
• noun etc. See under Bond, Book, etc.
• noun death.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun An action, state of mind, or object one has an obligation to perform for another, adopt toward another, or give to another.
• noun The state or condition of owing something to another.
• noun Money that one person or entity owes or is required to pay to another, generally as a result of a loan or other financial transaction.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the state of owing something (especially money)
• noun an obligation to pay or do something
• noun money or goods or services owed by one person to another