The definition of a damper is a device that is used to reduce the amount of vibration or noise that is produced by a system. It is usually used in air conditioning systems, exhaust systems, and other mechanical systems. Dampers are designed to absorb the shock and reduce the sound or vibration that is produced. They are typically made of metal or rubber and can be adjustable to allow for different levels of dampening. Dampers can also be used to regulate the flow of air or other gases, such as in air conditioning systems. In addition, dampers can be used to control the speed of a fan or other mechanical system. In general, dampers are an important part of many mechanical systems and can help to reduce noise and vibration, as well as regulate the flow of air or other gases.