1. (a.) Next in order after the seventeenth.
2. (a.) Consisting of one of eighteen equal parts or divisions of a thing.
3. (n.) The quotient of a unit divided by eighteen; one of eighteen equal parts or divisions.
4. (n.) The eighth after the tenth.
| Eighteenth 1. (a.) Next in order after the seventeenth. 2. (a.) Consisting of one of eighteen equal parts or divisions of a thing. 3. (n.) The quotient of a unit divided by eighteen; one of eighteen equal parts or divisions. 4. (n.) The eighth after the tenth. | |