thirteen

[thur-teen]
noun
1.
a cardinal number, 10 plus 3.
2.
a symbol for this number, as 13 or XIII.
3.
a set of this many persons or things.
adjective
4.
amounting to 13 in number.

Origin:
before 900; late Middle English thirttene, variant of Middle English thrittene, Old English thrēotēne; cognate with Dutch dertien, German dreizehn, Old Norse threttān. See three, -teen

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World English Dictionary
thirteen (ˈθɜːˈtiːn)
 
n
1.  See also number the cardinal number that is the sum of ten and three and is a prime number
2.  a numeral, 13, XIII, etc, representing this number
3.  the amount or quantity that is three more than ten; baker's dozen
4.  something represented by, representing, or consisting of 13 units
 
determiner
5.  a.  amounting to thirteen: thirteen buses
 b.  (as pronoun): thirteen of them fell
 
[Old English threotēne; see three, -teen]

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

thirteen
c.1430, metathesis of O.E. þreotene (Mercian), þreotiene (W.Saxon), from þreo "three" + -tene (see -teen). Cf. O.Fris. thretten, Du. dertien, Ger. dreizehn. Not an unlucky number in medieval England, but associated rather with the customary "extra item" (e.g.
baker's dozen). Superstitions began with association with the Last Supper, and the unluckiness of 13 sitting down together to dine (attested from 1695). Most of the modern superstitions (buildings with floor "12-A," etc.) have developed since 1890.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences for +thirteen
The following list contains short summaries of each of the thirteen articles.
At the party, there were thirteen guests at the dinner table.
It is a concise listing of thirteen fundamental doctrines of mormonism.
Thirteen days later, to see the relief efforts, they traveled to the affected
  areas.
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