fifteen

[fif-teen]
noun
1.
a cardinal number, ten plus five.
2.
a symbol for this number, as 15 or XV.
3.
a set of this many persons or things.
adjective
4.
amounting to 15 in number.

Origin:
before 900; Middle English, Old English fiftene. See five, -teen

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World English Dictionary
fifteen (ˈfɪfˈtiːn)
 
n
1.  the cardinal number that is the sum of ten and five
2.  a numeral, 15, XV, etc, representing this number
3.  something represented by, representing, or consisting of 15 units
4.  a rugby union football team
 
determiner
5.  a.  amounting to fifteen: fifteen jokes
 b.  (as pronoun): fifteen of us danced
 
[Old English fīftēne]

Fifteen (ˈfɪfˈtiːn)
 
n
(Brit) history the Fifteen the Jacobite rising of 1715

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

fifteen
O.E. fiftyne, from fif "five" + tyne "teen," from ten "ten." (cf. O.N. fimtan, Swed. femton, Du. vüftien, Ger. fünfzehn, Goth. fimftaihun).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Fifteen miners were trapped in a coal mine today after an underground
  explosion, the authorities said.
Fifteen years on, the country is praised for salving the wounds of genocide.
Over the past fifteen years, paleontologists have described more than twenty
  species of feathered dinosaurs.
The jury fixed the penalty at fifteen years in the penitentiary.
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