Auction.com

Auction means a system where potential buyers place competitive bids on assets and services.  The asset or service in question will sell to the party that places the highest bid.  In most cases, sellers will pay a listing fee to the auctioneer, regardless of whether the item actually sells for the desired price.
    
For example, Google used a modified form of auctioning called the Dutch auction when it issued its IPO.  In this form of auction, prospective buyers submitted bids that included the number of shares desired and what desired and what the bidder was willing to pay for them.  After the auction ended, the underwriters sorted through bids in order to determine the minimum priced bid they would accept from buyers.  The IPO was priced at $85.  The internet has increased the amount of exposure that auctions now have, and bidders no longer have to be physically present to participate.  Online marketplaces such as eBay connect buyers and sellers worldwide by allowing individuals to submit their bids ( or list their products) online and send payment electronically.

Auction Rate means the interest rate that will be paid on a specific security as determined by the Dutch auction process. The auctions take place at periodic intervals, and the interest rate is fixed until the next auctions are held.  This process is commonly used to determine the interest rate on Treasury bills.

Auction Market means a market in which buyers enter competitive bids and sellers enter competitive offers at the same time. The price a stock is traded represents the highest price that a buyer is willing to pay and the lowest price that a seller is willing to sell at.  Matching bids and offers are then paired together and the orders are executed.