sixth

[siksth]
adjective
1.
next after the fifth; being the ordinal number for six.
2.
being one of six equal parts.
noun
3.
a sixth part, especially of one (1/6).
4.
the sixth member of a series.
5.
Music.
a.
a tone on the sixth degree from a given tone (counted as a first).
b.
the interval between such tones.
c.
the harmonic combination of such tones.
adverb
6.
in the sixth place; sixthly.

Origin:
before 900; six + -th2; replacing sixt, Middle English sixte, Old English sixta

sixthly, adverb
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sixth (sɪksθ)
 
adj
1.  (usually prenominal)
 a.  coming after the fifth and before the seventh in numbering or counting order, position, time, etc; being the ordinal number of six: often written 6th
 b.  (as noun): the sixth to go
 
n
2.  a.  one of six equal or nearly equal parts of an object, quantity, measurement, etc
 b.  (as modifier): a sixth part
3.  the fraction equal to one divided by six (1/6)
4.  music
 a.  the interval between one note and another note six notes away from it counting inclusively along the diatonic scale
 b.  major minor See also interval one of two notes constituting such an interval in relation to the other
 c.  short for sixth chord
 
adv
5.  Also: sixthly after the fifth person, position, etc
 
sentence connector
6.  Also: sixthly as the sixth point: linking what follows to the previous statements

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

sixth
O.E. syxte, from siex (see six). Sixth sense "supernatural perception of objects" is attested from 1807; earlier it meant "the sense that apprehends sexual pleasure" (1699).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Sixth period was lively and edgy, but sometimes interesting.
Today, according to many biologists, we're in the midst of a sixth great
  extinction.
Only about a sixth of the world's nations practise birthright citizenship.
About the sixth week the two parts of the pancreas meet and fuse and a
  communication is established between their ducts.
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