Etymology
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eighteenth (adj., n.)

"next in order after the seventeenth; an ordinal numeral; being one of eighteen equal parts into which a whole is regarded as divided;" mid-13c., egtetenþe, modified, by influence of eighteen, from Old English eahtateoða; from eight + teoða "tenth" (see -ty (1)). Cognate with German achtzehnte, Danish attende, Swedish adertonde.

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Definitions of eighteenth
1
eighteenth (n.)
position 18 in a countable series of things;
2
eighteenth (adj.)
coming next after the seventeenth in position;
Synonyms: th
From wordnet.princeton.edu