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English definition of “eighteenth”

eighteenth

adjective, adverb, noun [C]    /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 adjective, adverb, noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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