1. (n.) Any substance used for making bodies adhere to each other, as mortar, glue, etc.

2. (n.) A kind of calcined limestone, or a calcined mixture of clay and lime, for making mortar which will harden under water.

3. (n.) The powder used in cementation. See Cementation.

4. (n.) Bond of union; that which unites firmly, as persons in friendship, or men in society.

5. (n.) The layer of bone investing the root and neck of a tooth; -- called also cementum.

6. (n.) To unite or cause to adhere by means of a cement.

7. (n.) To unite firmly or closely.

8. (n.) To overlay or coat with cement; as, to cement a cellar bottom.

9. (v. i.) To become cemented or firmly united; to cohere.