Eighteenth
From BiblePortal Wikipedia
Webster's Dictionary [1]
(1): ( a.) Consisting of one of eighteen equal parts or divisions of a thing.
(2): ( n.) The quotient of a unit divided by eighteen; one of eighteen equal parts or divisions.
(3): ( a.) Next in order after the seventeenth.
(4): ( n.) The eighth after the tenth.
King James Dictionary [2]
Eighteenth, a. 'ateenth. The next in order after the seventeenth.