1.  debt(n = noun.state) - the state of owing something (especially money); "he is badly in debt"
is a kind of financial obligation, indebtedness, liability

2.  debt(n = noun.possession) - money or goods or services owed by one person to another;
is a kind of liabilities
has particulars: arrears, national debt, public debt, debt ceiling, debt limit, bad debt, installment debt, loan, principal, score

3.  debt(n = noun.communication) - an obligation to pay or do something;
is a kind of obligation

debt, n.
1 something that is owed, esp. money.
2 a state of obligation to pay something owed (in debt; out of debt; get into debt).

Idiom:
debt-collector a person who is employed to collect debts for creditors. debt of honour a debt not legally recoverable, esp. a sum lost in gambling. in a person's debt under an obligation to a person.

Etymology:
ME det(te) f. OF dette (later debte) ult. f. L debitum past part. of debere owe

N  property, possession, suum cuique, meum et tuum, ownership, proprietorship, lordship, seignority, empire, interest, stake, estate, right, title, claim, demand, holding, tenure, vested interest, contingent interest, beneficial interest, equitable interest, use, trust, benefit, legal estate, equitable estate, seizin, seisin, absolute interest, paramount estate, freehold, fee tail, fee simple, estate in fee, estate in tail, estate tail, estate in tail male, estate in tail female, estate in tail general, limitation, term, lease, settlement, strict settlement, particular estate, estate for life, estate for years, estate pur autre vie, remainder, reversion, expectancy, possibility, dower, dowry, jointure, appanage, inheritance, heritage, patrimony, alimony, legacy, Falcidian law, paternal estate, thirds, assets, belongings, means, resources, circumstances, wealth, money, what one is worth, what one will cut up for, estate and effects, landed property, landed real estate property, realty, land, lands, tenements, hereditaments, corporeal hereditaments, incorporeal hereditaments, acres, ground, acquest, messuage, toft, territory, state, kingdom, principality, realm, empire, protectorate, sphere of influence, manor, honor, domain, demesne, farm, plantation, hacienda, allodium, fief, fieff, feoff, feud, zemindary, dependency, arado, merestead, ranch, free lease-holds, copy lease-holds, folkland, chattels real, fixtures, plant, heirloom, easement, right of common, right of user, personal property, personal estate, personal effects, personalty, chattels, goods, effects, movables, stock, stock in trade, things, traps, rattletraps, paraphernalia, equipage, parcels, appurtenances, impedimenta, luggage, baggage, bag and baggage, pelf, cargo, lading, rent roll, income, maul and wedges, patent, copyright, chose in action, credit, debt, one's own, landed, predial, manorial, allodial, free lease-hold, copy lease-hold, feudal, feodal, to one's credit, to one's account, to the good, to one and his heirs for ever, to one and the heirs of his body, to one and his heirs and assigns, to one and his executors administrators and assign.

N  debt, obligation, liability, indebtment, debit, score, bill, check, account (credit), arrears, deferred payment, deficit, default, insolvency, bad debt, interest, premium, usance, usury, floating debt, floating capital, debtor, debitor, mortgagor, defaulter, borrower, indebted, liable, chargeable, answerable for, in debt, in embarrassed circumstances, in difficulties, incumbered, involved, involved in debt, plunged in debt, deep in debt, over one's head in debt, over head and ears in debt, deeply involved, fast tied up, insolvent, minus, out of pocket, unpaid, unrequited, unrewarded, owing, due, in arrear, outstanding, past due, aes alienum debitorem leve gravius inimicum facit, neither a borrower nor a lender be.

bad debt, debt ceiling, debt instrument, debt limit, debt service, installment debt, national debt, national debt ceiling, oxygen debt, public debt