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Related to cotter: Cotter Joint
1. any part, such as a pin, wedge, key, etc., that is used to secure two other parts so that relative motion between them is prevented
2. short for cotter pin
1. English history a villein in late Anglo-Saxon and early Norman times occupying a cottage and land in return for labour
2. a peasant occupying a cottage and land in the Scottish Highlands under the same tenure as an Irish cottier
A tapered piece that can be driven in a tapered hole to hold together an assembly of machine or structural parts.
A beveled piece of wood or steel, used as a wedge for fastening.