Definition: "Dead centre" is a noun that refers to a specific position in a mechanical system, particularly in engines or machinery. It describes the position of a crank (a part that helps convert circular motion into linear motion) when it is perfectly aligned with the connecting rod, meaning it is not producing any force or torque at that moment.
In summary, "dead centre" is a technical term used in mechanics to describe a specific position of a crank where no torque is exerted.