The position of the crank of a piston when it is in line with the connecting rod
the position of a crank when it is in line with the connecting rod and not exerting torque
state in which there is total balance within a mechanism; condition in which there is no movement; exact center
The point at the end of each stroke of a moving crank and connecting rod at which the two lie in the same straight line and the turning force applied by the connecting rod is zero. Also called dead point