silent auction noun2 •An auction where people write secret bids on a piece of paper, and whoever has the highest bid wins the item.A well-run silent auction for a normal event should raise anything between $500 and $3000 and sometimes, considerably more. — 2003 •An auction held over a long period of time where people write public bids on a piece of paper, and whoever has the highest bid wins the item. formssilent auctions