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Definition of cement
a powdery substance made with calcined lime and clay. It is mixed with water to form mortar or mixed with sand, gravel, and water to make concrete. a soft glue that hardens on setting:rubber cement an element that unites a group of people:traditional entertainment was a form of community cement a substance for filling cavities in teeth. (also cementum) Anatomy a thin layer of bony material that fixes teeth to the jaw. Geology the material that binds particles together in sedimentary rock.
verb [with object]
attach with cement:wooden posts were cemented into the ground settle or establish firmly:the two firms are expected to cement an agreement soon Geology (of a material) bind (particles) together in sedimentary rock.