COTTER definition: a pin, wedge, key, or the like, fitted or driven into an opening to secure something or hold parts together. See examples of cotter used in a sentence.

The meaning of COTTER is a wedge-shaped or tapered piece used to fasten together parts of a structure.

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5 meanings: 1. any part, such as a pin, wedge, key, etc, that is used to secure two other parts so that relative motion between.... Click for more definitions.

Nov 27, 2025 · The terms cotter and cotter pin are sometimes used interchangeably, although they have different functions. For a more detailed explanation see Wikipedia articles on cotter …

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cot•ter (ˈkɒt ər) n. 1. a pin, wedge, or the like inserted into an opening to secure something or hold parts together. 2. cotter pin.

Cotter definition: A bolt, wedge, key, or pin inserted through a slot in order to hold parts together.

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