(kinematics) Any one of the several elementary pieces of a mechanism, such as the fixed frame, or a rod, wheel, mass of confined liquid, etc., by which relative motion of other parts is produced and constrained.
(engineering) Any intermediate rod or piece for transmitting force or motion, especially a short connecting rod with a bearing at each end; specifically (in steam engines) the slotted bar, or connecting piece, to the opposite ends of which the eccentric rods are jointed, and by means of which the movement of the valve is varied, in a link motion.
(surveying) The length of one joint of Gunter's chain, being the hundredth part of it, or 7.92 inches, the chain being 66 feet in length.
(chemistry) A bond of affinity, or a unit of valence between atoms; applied to a unit of chemical force or attraction.
