A joint is the location at which two or more bones make contact. They are constructed to allow movement and provide mechanical support, and are classified structurally and functionally. Joints are mainly classified structurally and functionally.

Structural classification is determined by how the bones connect to each other, while functional classification is determined by the degree of movement between the articulating bones. In practice, there is significant overlap between the two types of classifications. Terms ending in the suffix -sis are singular and refer to just one joint, while -ses is the suffix for pluralization.

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