fifteenth

[fif-teenth]

Origin:
before 900; Middle English fiftenthe (see fifteen, -th2); replacing Middle English fiftethe, Old English fīftēotha

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fifteenth (ˈfɪfˈtiːnθ)
 
adj
1.  a.  coming after the fourteenth in order, position, time, etc. Often written: 15th
 b.  (as noun): the fifteenth of the month
 
n
2.  a.  one of 15 equal or nearly equal parts of something
 b.  (as modifier): a fifteenth part
3.  the fraction equal to one divided by 15 (1/15)
4.  a.  an interval of two octaves
 b.  one of two notes constituting such an interval in relation to the other, esp the one higher in pitch
 c.  an organ stop of diapason quality sounding a note two octaves higher than that normally produced by the key depressed; a two-foot stop

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Example sentences
He was burned at the stake in the fifteenth century for heresy.
At the time, scientists were split between two explanations for sudden
  appearance of syphilis at the end of the fifteenth century.
There are some nuclear particles that only show up once in ten to the fifteenth
  power number of particle interactions.
Literacy was already widely-disseminated in the fifteenth century.
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