eighteenth

UK:**UK and possibly other pronunciationsUK and possibly other pronunciations/ˌeɪˈtiːnθ/US:USA pronunciation: respellingUSA pronunciation: respellingtēnth)


WordReference Random House Unabridged Dictionary of American English © 2026
eight•eenth  tēnth),USA pronunciation adj. 
  1. next after the seventeenth;
    being the ordinal number for 18.
  2. being one of 18 equal parts.

n. 
  1. an eighteenth part, esp. of one (118).
  2. the eighteenth member of a series.
  • Middle English eightenthe, eightethe, Old English eahtatēotha. See eighteen + -th2 bef. 900

Collins Concise English Dictionary © HarperCollins Publishers::
eighteenth /ˈeɪˈtiːnθ/ adj
  1. (usually prenominal)
    • coming after the seventeenth in numbering or counting order, position, time, etc; being the ordinal number of eighteen: often written 18th
    • (as noun): come on the eighteenth
n
    • one of 18 approximately equal parts of something
    • (as modifier): an eighteenth part
  1. the fraction that is equal to one divided by 18 ( 118)
'eighteenth' also found in these entries (note: many are not synonyms or translations):

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