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English definition of “eighteenth”

eighteenth

adjective, adverb, noun [C]  /eɪtˈtinθ/ us  
(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)
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