down payment

English Thesaurus

1. a partial payment made at the time of purchase; the balance to be paid later (noun.possession)

hypernym	:	payment,
definition	:	a sum of money paid or a claim discharged (noun.possession)

hyponym	:	margin, security deposit,
definition	:	the amount of collateral a customer deposits with a broker when borrowing from the broker to buy securities (noun.possession)