1. An offer made by an investor, a trader or a dealer to buy a security. The bid will stipulate both the price at which the buyer is willing to purchase the security and the quantity to be purchased. 2. The price at which a market maker is willing to buy a security. The market maker will also display an ask price, or the amount and price at which it is willing to sell.

An offer of a price, especially at an auction.

to offer a particular amount of money for something that is for sale and compete against other people to buy it, especially at a public sale of goods or property