Torque

[1] Turning or twisting force such as the force imparted on the drive line by the engine. Usually measured in lb-ft or Nm (newton-meter). It differs from work or power in that torque does not necessarily produce motion. Basically, the magnitude of a torque acting on a body is the product of the magnitude of a force and its force arm (perpendicular distance from the axis of rotation of the body to the line of action of the force). This product is called the moment of the torque about the axis or the torque.
[2] To tighten a nut or bolt with a torque wrench. See bottom end torque, dial torque wrench, hydrodynamic torque converter, interchangeable head torque wrench, lock-up torque converter, lockup torque converter, midrange torque, self-aligning torque.