| a. | 1. | Next in order after the seventeenth. |
| 2. | Consisting of one of eighteen equal parts or divisions of a thing. | |
| n. | 1. | The quotient of a unit divided by eighteen; one of eighteen equal parts or divisions. |
| 2. | The eighth after the tenth. |
| Noun | 1. | eighteenth - position 18 in a countable series of things |
| Adj. | 1. | eighteenth - coming next after the seventeenth in position Synonyms: 18th |
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