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[ey-teenth] /ˈeɪˈtinθ/
next after the seventeenth; being the ordinal number for 18.
being one of 18 equal parts.
an eighteenth part, especially of one (1/18).
the eighteenth member of a series.
Origin of eighteenth
before 900; Middle English eightenthe, eightethe, Old English eahtatēotha. See eighteen + -th2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for eighteenth
  • Is preserved especially its architecture, dating from the eighteenth century.
  • It makes perfect sense for an eighteenth century thinker to conclude that humanity would flourish under the market.
  • The flies probably traveled aboard ships using the transatlantic trade routes during the seventeenth and eighteenth centuries.
  • The inn dates to the eighteenth century, and remains open for lodging and dining.
  • By the end of the eighteenth century, guilds had been abolished.
  • They posed on their eighteenth-century marble staircase and smiled, but not too broadly.
  • Of a considerable number of songs of the eighteenth century, the authorship is either doubtful or quite unknown.
  • It is only in part due to the additional burdens imposed upon our judicial system by the eighteenth amendment.
  • He displayed genius in his ability to discern what was real beneath the formality and affectation of eighteenth century manners.
  • He belonged to the eighteenth century, and the eighteenth century upset all his plans.
British Dictionary definitions for eighteenth


(usually prenominal)
  1. coming after the seventeenth in numbering or counting order, position, time, etc; being the ordinal number of eighteen: often written 18th
  2. (as noun): come on the eighteenth
  1. one of 18 approximately equal parts of something
  2. (as modifier): an eighteenth part
the fraction that is equal to one divided by 18 (1/18)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for eighteenth

mid-13c., egtetenþe, modified, by influence of eighteen, from Old English eahtateoða; from eight + teoða "tenth" (see -ty (1)).

Online Etymology Dictionary, © 2010 Douglas Harper
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