deposit1 noun Related topics: Banking, Geology, Votingde???pos???it1 W3 [countable]1 a part of the cost of something you are buying that you pay some time before you pay the rest of it deposit of A deposit of 10% is required. put down a deposit (on something) (=pay a deposit) We put down a deposit on a house.2 money that you pay when you rent something such as an apartment or car, which will be gi