- 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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for eighteenth
I can't rebuild my apartment on the fifth floor while you keep your apartment on the eighteenth floor just as it is.Hell, No, Not So Low
October 16, 2012
William Blake, the eighteenth century poet, illustrator, engraver and mystic, worked from home but lived in his imagination.William Blake's Heavenly Imagination
November 12, 2009
The close of the eighteenth century shortened the one as much as the other.Leading Articles on Various Subjects
If you doubt it, read the literature of the eighteenth century.Audrey Craven
This house dated from about the beginning of the eighteenth century.
Titchfield Street was built about the end of the eighteenth century.
This journal is the best on the subject, written in the eighteenth century.Afloat on the Ohio
Reuben Gold Thwaites
- (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
- one of 18 approximately equal parts of something
- (as modifier)an eighteenth part
- the fraction that is equal to one divided by 18 (1/18)
Word Origin and History for eighteenth
Online Etymology Dictionary, © 2010 Douglas Harper