Meaning of “eighteenth” in the English Dictionary

"eighteenth" in American English

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eighteenthadjective, adverb, noun [ C ]

us /eɪtˈtinθ/

(in the position of) the number 18 in a series; 18th:

He ranks eighteenth in the world.
[ C ] Ann-Marie’s birthday is the eighteenth of October.

An eighteenth is one of eighteen equal parts of something.

(Definition of “eighteenth” from the Cambridge Academic Content Dictionary © Cambridge University Press)