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Definitions of cement:
noun: something that hardens to act as adhesive material
noun: a building material that is a powder made of a mixture of calcined limestone and clay; used with water and sand or gravel to make concrete and mortar
noun: concrete pavement is sometimes referred to as cement
Example: "They stood on the gray cement beside the pool"
noun: any of various materials used by dentists to fill cavities in teeth
noun: a specialized bony substance covering the root of a tooth