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A flat piece of material, usually wood, used to wedge timber or steel supports against the ground and to make secure the space between supports.
A persistence of the electric charge image in a camera tube for a small number of frames.
The difference in time between two events or values considered together.
On drawings, abbr. for lagging.
ii. The angular crankshaft movement between a reference position such as TDC (top dead center), BDC (bottom dead center), and the opening or closure of a valve. Also called valve lag.
iii. The angular movement between the helicopter hub and the temporary slower blade.
iv. The delay in the human reaction to an event.