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The Collaborative International Dictionary of English v.0.48 (gcide)

Eighteenth \Eight"eenth`\, a. [From {Eighteen}.]
1. Next in order after the seventeenth.
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2. Consisting of one of eighteen equal parts or divisions of
a thing.
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Eighteenth \Eight"eenth`\, n.
1. The quotient of a unit divided by eighteen; one of
eighteen equal parts or divisions.
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2. The eighth after the tenth.
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