The term "ventilated" has several meanings, depending on its context.
1) In a general sense, it means to allow air or gas to circulate through an area by providing openings for incoming and outgoing air. For example, one can say that the room was well-ventilated after opening all the windows.
2) It can also mean to express strong emotions such as anger or frustration. For instance, he ventilated his feelings about the unfair treatment at work.
3) In a more specific sense, "ventilated" is used in finance and economics to describe a situation where there has been an increase in supply of a security or asset without any corresponding demand, leading to a decrease in its price. For example, if a large number of shares of a company are sold in the market without any buyers, it can be said that the stock was ventilated.