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English definition of “eighteenth”

eighteenth

ordinal number uk   /ˌeɪˈtiːnθ/ us  
18th written as a word: Next Monday is the eighteenth (of February).Ordinal numbers

eighteenth

noun [C] uk   /ˌeɪˈtiːnθ/ us  
one of 18 equal parts of somethingFractions
(Definition of eighteenth from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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