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  Dictionary Definition of cog

cog [1]
noun
1. a tooth or projection (usu. one of a series) on a wheel, etc., for transmitting motion to, or receiving motion from, a corresponding tooth or part with which it engages.
2. a cogwheel.
3. a person of little importance, in a large organisation.
4. Carpentry a rectangular piece of wood let into notches in two adjacent timbers to prevent sliding.
[ME cogge, akin to CUDGEL ]