| a. | 1. | Eight and ten; |
| n. | 1. | The number greater by a unit than seventeen; eighteen units or objects. |
| 2. | A symbol denoting eighteen units, as 18 or xviii. |
| Noun | 1. | eighteen - the cardinal number that is the sum of seventeen and one |
| Adj. | 1. | eighteen - being one more than seventeen |
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