next after the eleventh; being the ordinal number for 12.
being one of 12 equal parts.
a twelfth part, especially of one (1/12).
the twelfth member of a series.

before 900; Middle English twelfthe, twelfte, Old English twelfta, equivalent to twelf twelve + -ta -th2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
twelfth (twɛlfθ)
1.  (usually prenominal)
 a.  coming after the eleventh in number or counting order, position, time, etc; being the ordinal number of twelve: often written 12th
 b.  (as noun): the twelfth of the month
2.  a.  one of 12 equal or nearly equal parts of an object, quantity, measurement, etc
 b.  (as modifier): a twelfth part
3.  the fraction equal to one divided by 12 (1/12)
4.  music
 a.  an interval of one octave plus a fifth
 b.  one of two notes constituting such an interval in relation to the other
 c.  an organ stop sounding a note one octave and a fifth higher than that normally produced by the key depressed
[from Old English twelfta]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. twelfta, cognate with O.N. tolfti, O.Fris. twelefta, O.H.G. zwelifto, Ger. zwölfte (see twelve). O.E. twelftan niht "Twelfth Night," the eve of Epiphany, which comes twelve days after Christmas, formerly was a time of merrymaking.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for twelfth
It was extensive in the twelfth and thirteenth dynasties and contained many rich tombs.
It included the twelfth and eighteenth episodes of the series.
A twelfth school house is in the early stages of development.
The country ranked twelfth in the world for its number of active troops in service.
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