Eighteenth Definition
 ā-tēnth 
    noun
  
 The ordinal number matching the number 18 in a series.
 American Heritage 
The one following the seventeenth.
 Webster's New World 
Any one of the eighteen equal parts of something;118
 Webster's New World 
The person or thing in the eighteenth position.
 Wiktionary 
    adjective
  
 Preceded by seventeen others in a series; 18th.
 Webster's New World 
Designating any of the eighteen equal parts of something.
 Webster's New World 
The ordinal form of the number eighteen.
Wiktionary 
Synonyms: 
  
    adverb
  
 In the eighteenth place, rank, group, etc.
 Webster's New World 
Other Word Forms of Eighteenth
Noun
Singular:
 eighteenthPlural:
 eighteenthsEighteenth Is Also Mentioned In
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